{"id":2639,"date":"2024-01-18T12:17:44","date_gmt":"2024-01-18T12:17:44","guid":{"rendered":"https:\/\/www.bgs.ac.uk\/groundwater\/quality\/shale-gas\/aquifers-and-shales\/aquifer-shale-separation-maps\/"},"modified":"2025-11-27T10:13:10","modified_gmt":"2025-11-27T10:13:10","slug":"aquifer-shale-separation-maps","status":"publish","type":"page","link":"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/","title":{"rendered":"Aquifer\/shale separation maps"},"content":{"rendered":"\t\t\t<section class=\"hero-section hero-section-with-social\">\n\t\t\t\t\t\t\t\t<div class=\"hero-info-wrap\">\n\t\t\t\t\t<div class=\"container\">\n\t\t\t\t\t\t<div class=\"row\">\n\t\t\t\t\t\t\t<div class=\"col-12\">\n\t\t\t\t\t\t\t\t<div class=\"hero-info\">\n\t\t\t\t\t\t\t\t\t<h1>Aquifer\/shale separation maps<\/h1>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n\t\t\t<div class=\"social-wrap social-wrap-inline-them\">\n\t\t\t\t<div class=\"sea-background-f\">\n\t\t\t\t\t<span>Share this article<\/span><a target=\"_blank\"  href=\"https:\/\/www.facebook.com\/sharer\/sharer.php?u=https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/\"><span class=\"icon-facebook\"><span class=\"hidden\">Facebook<\/span><\/span><\/a><a target=\"_blank\"  href=\"https:\/\/twitter.com\/intent\/tweet?text=Aquifer\/shale%20separation%20maps&#038;url=https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/\"><span class=\"icon-twitter\"><span class=\"hidden\">Twitter<\/span><\/span><\/a><a   onclick=\"javascript:void( (function() {var e=document.createElement('script' );e.setAttribute('type','text\/javascript' );e.setAttribute('charset','UTF-8' );e.setAttribute('src','\/\/assets.pinterest.com\/js\/pinmarklet.js?r='+Math.random()*99999999);document.body.appendChild(e)})());\"  href=\"javascript:void(0);\"><span class=\"icon-pinterest\"><span class=\"hidden\">Pinterest<\/span><\/span><\/a><a target=\"_blank\"  href=\"https:\/\/wa.me?text=https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/\"><span class=\"icon-whatsapp\"><span class=\"hidden\">WhatsApp<\/span><\/span><\/a><a   href=\"mailto:?subject=Aquifer\/shale%20separation%20maps&#038;body=%20(https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/)\"><span class=\"icon-mail\"><span class=\"hidden\">Email<\/span><\/span><\/a><a href=\"#\" data-copy=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/\" class=\"copy-url-on-click\"><span class=\"icon-link\"><span class=\"hidden\">Copy Link<\/span><\/span><\/a><\/div><\/div>\t\t\t\t\t\t\t<\/section>\n\t\t\t\n\n\n<section class=\"wp-block-bgs-blocks-content-container content-section\"><div class=\"container\"><div class=\"row\"><div class=\"col-12\">\n<p>Use this page to choose one of the 25 maps showing the vertical separation between aquifer\/shale or aquifer\/clay pairs. Each map has a link to find further information about each of the aquifer and shale\/clay unit pairs. <\/p>\n\n\n\n<p>Go to an aquifer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#crag\">Crag<\/a><\/li>\n\n\n\n<li><a href=\"#chalk\">Chalk<\/a><\/li>\n\n\n\n<li><a href=\"#lgreen\">Lower Greensand<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS\">Spilsby Sandstone<\/a><\/li>\n\n\n\n<li><a href=\"#coral\">Corallian limestone<\/a><\/li>\n\n\n\n<li><a href=\"#oolites\">Oolites<\/a><\/li>\n\n\n\n<li><a href=\"#triassic\">Triassic sandstone<\/a><\/li>\n\n\n\n<li><a href=\"#mag\">Magnesian limestone<\/a><\/li>\n\n\n\n<li><a href=\"#permian\">Permian sandstone<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">About the separation maps<\/h2>\n\n\n\n<p>More information on how the separation maps have been calculated and how they should be used and interpreted can be found in the&nbsp;<a href=\"https:\/\/www2.bgs.ac.uk\/groundwater\/shaleGas\/aquifersAndShales\/methods.html\">methods<\/a>&nbsp;section or download the&nbsp;<a href=\"https:\/\/www2.bgs.ac.uk\/groundwater\/shaleGas\/aquifersAndShales\/data.html\">data<\/a>&nbsp;used to prepare the maps.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"crag\">Crag<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-ka.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAG&quot;&gt;Crag Group&lt;\/a&gt; vs. &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC&quot;&gt;Kimmeridge Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=AMC&quot;&gt;Ampthill Clay Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/crag-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_804\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-ka.png\" class=\"attachment-medium size-medium\" alt=\"cr-ka\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAG\">Crag Group<\/a> vs. <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC\">Kimmeridge Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=AMC\">Ampthill Clay Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/crag-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-ka.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-koo.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAG&quot;&gt;Crag Group&lt;\/a&gt; vs. &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Kellaways Formation&lt;\/a&gt;, &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC&quot;&gt;Oxford Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY&quot;&gt;Osgodby Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/crag-kellaways-oxford-clay-and-osgodby-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_804\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-koo.png\" class=\"attachment-medium size-medium\" alt=\"cr-koo\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAG\">Crag Group<\/a> vs. <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Kellaways Formation<\/a>, <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC\">Oxford Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY\">Osgodby Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/crag-kellaways-oxford-clay-and-osgodby-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-koo.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-l.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAG&quot;&gt;Crag Group&lt;\/a&gt; vs. &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI&quot;&gt;Lias Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/crag-lias-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_804\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-l.png\" class=\"attachment-medium size-medium\" alt=\"cr-l\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAG\">Crag Group<\/a> vs. <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI\">Lias Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/crag-lias-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/cr-l.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"chalk\">Chalk<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-ka.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CK&quot;&gt;Chalk&lt;\/a&gt; vs. &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC&quot;&gt;Kimmeridge Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC&quot;&gt;Ampthill Clay Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/chalk-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_53734\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-ka.png\" class=\"attachment-medium size-medium\" alt=\"ch-ka\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CK\">Chalk<\/a> vs. <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC\">Kimmeridge Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC\">Ampthill Clay Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/chalk-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-ka.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-koo.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Chalk&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Kellaways Formation&lt;\/a&gt;, &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Oxford Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Osgodby Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/chalk-kellaways-oxford-clay-and-osgodby-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_53734\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-koo.png\" class=\"attachment-medium size-medium\" alt=\"ch-koo\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Chalk<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Kellaways Formation<\/a>, <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Oxford Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Osgodby Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/chalk-kellaways-oxford-clay-and-osgodby-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-koo.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-l.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CK&quot;&gt;Chalk&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI&quot;&gt;Lias Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/chalk-lias-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_53734\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-l.png\" class=\"attachment-medium size-medium\" alt=\"ch-l\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CK\">Chalk<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI\">Lias Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/chalk-lias-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ch-l.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"lgreen\">Lower Greensand<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-ka.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS&quot;&gt;Lower Greensand&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC&quot;&gt;Kimmeridge Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=AMC&quot;&gt;Ampthill Clay Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_9547\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-ka.png\" class=\"attachment-medium size-medium\" alt=\"lg-ka\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS\">Lower Greensand<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC\">Kimmeridge Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=AMC\">Ampthill Clay Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-ka.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-koo.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS&quot;&gt;Lower Greensand&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Kellaways Formation&lt;\/a&gt;, &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC&quot;&gt;Oxford Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY&quot;&gt;Osgodby Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-kellaways-oxford-clay-and-osgodby-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_9547\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-koo.png\" class=\"attachment-medium size-medium\" alt=\"lg-koo\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS\">Lower Greensand<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Kellaways Formation<\/a>, <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC\">Oxford Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY\">Osgodby Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-kellaways-oxford-clay-and-osgodby-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-koo.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-l.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS&quot;&gt;Lower Greensand&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI&quot;&gt;Lias Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-lias-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_9547\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-l.png\" class=\"attachment-medium size-medium\" alt=\"lg-l\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS\">Lower Greensand<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI\">Lias Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-lias-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-l.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-bcg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS&quot;&gt;Lower Greensand&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG&quot;&gt;Bowland Shale Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV&quot;&gt;Craven Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-bowland-shale-formation-and-craven-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_9547\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-bcg.png\" class=\"attachment-medium size-medium\" alt=\"lg-bcg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LGS\">Lower Greensand<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG\">Bowland Shale Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV\">Craven Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/lower-greensand-bowland-shale-formation-and-craven-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/lg-bcg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"spilsby\">Spilsby Sandstone<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-ka.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS&quot;&gt;Spilsby Sandstone&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC&quot;&gt;Kimmeridge Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=AMC&quot;&gt;Ampthill\u00a0 Clay Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_77040\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-ka.png\" class=\"attachment-medium size-medium\" alt=\"ss-ka\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS\">Spilsby Sandstone<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KC\">Kimmeridge Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=AMC\">Ampthill\u00a0 Clay Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-kimmeridge-clay-and-ampthill-clay-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-ka.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-koo.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS&quot;&gt;Spilsby Sandstone&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Kellaways Formation&lt;\/a&gt;, &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC&quot;&gt;Oxford Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY&quot;&gt;Osgodby Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-kellaways-oxford-clay-and-osgodby-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_77040\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-koo.png\" class=\"attachment-medium size-medium\" alt=\"ss-koo\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS\">Spilsby Sandstone<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Kellaways Formation<\/a>, <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC\">Oxford Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY\">Osgodby Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-kellaways-oxford-clay-and-osgodby-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-koo.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-l.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS&quot;&gt;Spilsby Sandstone&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI&quot;&gt;Lias Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-lias-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_77040\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-l.png\" class=\"attachment-medium size-medium\" alt=\"ss-l\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS\">Spilsby Sandstone<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI\">Lias Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-lias-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-l.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-bcg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS&quot;&gt;Spilsby Sandstone&lt;\/a&gt; vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG&quot;&gt;Bowland Shale Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV&quot;&gt;Craven Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-bowland-shale-formation-and-craven-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_77040\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-bcg.png\" class=\"attachment-medium size-medium\" alt=\"ss-bcg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SYS\">Spilsby Sandstone<\/a> vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG\">Bowland Shale Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV\">Craven Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/spilsby-sandstone-bowland-shale-formation-and-craven-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ss-bcg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"coral\">Corallian limestone<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-koo.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CR&quot;&gt;Corallian&lt;\/a&gt; limestone vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB&quot;&gt;Kellaways Formation&lt;\/a&gt;, &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC&quot;&gt;Oxford Clay Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY&quot;&gt;Osgodby Formation&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/corallian-kellaways-oxford-clay-and-osgodby-formations-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_2905\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-koo.png\" class=\"attachment-medium size-medium\" alt=\"corl-koo\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CR\">Corallian<\/a> limestone vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KLB\">Kellaways Formation<\/a>, <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OXC\">Oxford Clay Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=OSBY\">Osgodby Formation<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/corallian-kellaways-oxford-clay-and-osgodby-formations-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-koo.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-l.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CR&quot;&gt;Corallian&lt;\/a&gt; limestone vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI&quot;&gt;Lias Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/corallian-limestone-lias-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_2905\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-l.png\" class=\"attachment-medium size-medium\" alt=\"corl-l\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CR\">Corallian<\/a> limestone vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI\">Lias Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/corallian-limestone-lias-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-l.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-bcg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CR&quot;&gt;Corallian&lt;\/a&gt; limestone vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG&quot;&gt;Bowland Shale Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV&quot;&gt;Craven Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/corallian-limestone-bowland-shale-formation-and-craven-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_2905\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-bcg.png\" class=\"attachment-medium size-medium\" alt=\"corl-bcg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p><a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CR\">Corallian<\/a> limestone vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG\">Bowland Shale Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV\">Craven Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/corallian-limestone-bowland-shale-formation-and-craven-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/corl-bcg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"oolites\">Oolites<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ool-l.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Oolites (&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=GOG&quot;&gt;Great Oolite&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=INO&quot;&gt;Inferior Oolite&lt;\/a&gt;) vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI&quot;&gt;Lias Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/oolites-lias-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_21518\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ool-l.png\" class=\"attachment-medium size-medium\" alt=\"ool-l\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Oolites (<a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=GOG\">Great Oolite<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=INO\">Inferior Oolite<\/a>) vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LI\">Lias Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/oolites-lias-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ool-l.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ool-bcg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Oolites (&lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=GOG&quot;&gt;Great Oolite&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=INO&quot;&gt;Inferior Oolite&lt;\/a&gt;) vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG&quot;&gt;Bowland Shale Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV&quot;&gt;Craven Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/oolites-bowland-shale-formation-and-craven-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_21518\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ool-bcg.png\" class=\"attachment-medium size-medium\" alt=\"ool-bcg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Oolites (<a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=GOG\">Great Oolite<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=INO\">Inferior Oolite<\/a>) vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG\">Bowland Shale Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV\">Craven Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/oolites-bowland-shale-formation-and-craven-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ool-bcg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"triassic\">Triassic sandstone<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-mg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Triassic sandstone vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=MARR&quot;&gt;Marros Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/triassic-sandstone-marros-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_33248\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-mg.png\" class=\"attachment-medium size-medium\" alt=\"ts-mg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Triassic sandstone vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=MARR\">Marros Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/triassic-sandstone-marros-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-mg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-bcg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Triassic sandstone vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG&quot;&gt;Bowland Shale Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV&quot;&gt;Craven Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/triassic-sandstone-bowland-shale-formation-and-craven-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_33248\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-bcg.png\" class=\"attachment-medium size-medium\" alt=\"ts-bcg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Triassic sandstone vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG\">Bowland Shale Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV\">Craven Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/triassic-sandstone-bowland-shale-formation-and-craven-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-bcg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-ucs.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Triassic sandstone vs Upper Cambrian shales. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/triassic-sandstone-upper-cambrian-shales-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_33248\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-ucs.png\" class=\"attachment-medium size-medium\" alt=\"ts-ucs\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Triassic sandstone vs Upper Cambrian shales. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/triassic-sandstone-upper-cambrian-shales-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ts-ucs.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"mag\">Magnesian limestone<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ml-bcg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Magnesian limestone vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG&quot;&gt;Bowland Shale Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV&quot;&gt;Craven Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/magnesian-limestone-bowland-shale-formation-and-craven-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_76302\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ml-bcg.png\" class=\"attachment-medium size-medium\" alt=\"ml-bcg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Magnesian limestone vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG\">Bowland Shale Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV\">Craven Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/magnesian-limestone-bowland-shale-formation-and-craven-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ml-bcg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<h2 class=\"wp-block-heading\" id=\"permian\">Permian sandstone<\/h2>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ps-bcg.png\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Permian sandstone vs &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG&quot;&gt;Bowland Shale Formation&lt;\/a&gt; and &lt;a href=&quot;https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV&quot;&gt;Craven Group&lt;\/a&gt;. BGS \u00a9 UKRI.&lt;\/p&gt;\n&lt;ul&gt;\n&lt;li&gt;&lt;a href=&quot;https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/permian-sandstone-bowland-shale-formation-and-craven-group-separation-map\/&quot;&gt;More information&lt;\/a&gt;&lt;\/li&gt;\n&lt;\/ul&gt;\n\" data-gallery=\"gallery_23611\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ps-bcg.png\" class=\"attachment-medium size-medium\" alt=\"ps-bcg\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Permian sandstone vs <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=BSG\">Bowland Shale Formation<\/a> and <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=CRAV\">Craven Group<\/a>. BGS \u00a9 UKRI.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/energy\/shale-gas-and-groundwater\/aquifers-and-shales\/aquifer-shale-separation-maps\/permian-sandstone-bowland-shale-formation-and-craven-group-separation-map\/\">More information<\/a><\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2025\/11\/ps-bcg.png\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div><\/div><\/div><\/section>\n\n\n<section class=\"cta-section  sea-background-e \">\n\t<div class=\"container\">\n\t\t<div class=\"row md-row\">\n\t\t\t<div class=\"col-12\">\n\t\t\t\t<h2>Need more information?<\/h2>\t\t\t\t\t\t\t\t<div class=\"btn-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/contact-the-person\/?employee=smedley-pauline\"  class=\"button primary-background   \">Contact Pauline Smedley<\/a><\/div>\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n<\/section>\n\t\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":6,"featured_media":0,"parent":2526,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"1","_relevanssi_noindex_reason":"","footnotes":""},"tags":[],"class_list":["post-2639","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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