{"id":74975,"date":"2021-07-21T19:42:44","date_gmt":"2021-07-21T19:42:44","guid":{"rendered":"https:\/\/www.bgs.ac.uk\/?page_id=74975"},"modified":"2022-08-23T09:35:57","modified_gmt":"2022-08-23T09:35:57","slug":"geology-of-arthurs-seat","status":"publish","type":"page","link":"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/geology-of-arthurs-seat\/","title":{"rendered":"Geology of Arthur&#8217;s Seat"},"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>A walking tour of the geology of Arthur\u2019s Seat<\/h1>\n\t\t\t\t\t\t\t\t\t<p>Discovering Geology &mdash; Maps and resources<\/p>\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\/discovering-geology\/maps-and-resources\/office-geology\/geology-of-arthurs-seat\/\"><span class=\"icon-facebook\"><span class=\"hidden\">Facebook<\/span><\/span><\/a><a target=\"_blank\"  href=\"https:\/\/twitter.com\/intent\/tweet?text=Geology%20of%20Arthur&#8217;s%20Seat&#038;url=https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/geology-of-arthurs-seat\/\"><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\/discovering-geology\/maps-and-resources\/office-geology\/geology-of-arthurs-seat\/\"><span class=\"icon-whatsapp\"><span class=\"hidden\">WhatsApp<\/span><\/span><\/a><a   href=\"mailto:?subject=Geology%20of%20Arthur&#8217;s%20Seat&#038;body=A%20short%20walk%20around%20Holyrood%20Park%20provides%20an%20insight%20into%20the%20geological%20history%20of%20area%20from%20the%20Carboniferous%20Period%20to%20now.%20(https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/geology-of-arthurs-seat\/)\"><span class=\"icon-mail\"><span class=\"hidden\">Email<\/span><\/span><\/a><a href=\"#\" data-copy=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/geology-of-arthurs-seat\/\" 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>The BGS office in Edinburgh is located on the western edge of the city. Visible from the office windows is the prominent hill of Arthur\u2019s Seat, standing proudly on the Edinburgh skyline.&nbsp;The form of the hill reflects the dynamic geological history that shaped the city, including ancient volcanic eruptions, tropical swamps and seas, and large glacial ice streams. <\/p>\n\n\n\n<p>A short walk around key localities in Holyrood Park provides an insight into the geological history of area from the Carboniferous Period (360 million years ago) to now.<\/p>\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\/wp-content\/uploads\/2021\/07\/Holyrood_Park_geological_map_001_web-1400x775.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 1&lt;\/strong&gt;\u00a0 Geological map of Holyrood Park, including Arthur\u2019s Seat and the Crags, with localities marked. Contains Ordnance Data \u00a9 Crown Copyright and database rights 2021 and \u00a9 BGS bedrock geology 1:50 000 map for the Holyrood Park area.&lt;\/p&gt;\n\" data-gallery=\"gallery_88004\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/Holyrood_Park_geological_map_001_web-960x532.jpg\" class=\"attachment-medium size-medium\" alt=\"Simplified bedrock geological map of Holyrood Park\" \/><\/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\/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><strong>Figure 1<\/strong>\u00a0 Geological map of Holyrood Park, including Arthur\u2019s Seat and the Crags, with localities marked. Contains Ordnance Data \u00a9 Crown Copyright and database rights 2021 and \u00a9 BGS bedrock geology 1:50 000 map for the Holyrood Park area.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/Holyrood_Park_geological_map_001_web-1400x775.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 1&lt;\/strong&gt;\u00a0 Geological map of Holyrood Park, including Arthur\u2019s Seat and the Crags, with localities marked. Contains Ordnance Data \u00a9 Crown Copyright and database rights 2021 and \u00a9 BGS bedrock geology 1:50 000 map for the Holyrood Park area.&lt;\/p&gt;\n\" data-gallery=\"gallery_88004\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/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\">Locality 1: Camstone Quarry<\/h2>\n\n\n\n<p>Starting on the north side of Holyrood Park, the remains of Camstone Quarry are found at Locality 1 on Figure 1. The sequence of sedimentary rocks visible here gives an insight into the local environment in the early Carboniferous Period. <\/p>\n\n\n\n<p>A repeated sequence of red-brown sandstone and grey mudstone, part of the Ballagan Formation, is exposed in the quarry. Preserved rock features, such as wave ripples and hexagonal desiccation cracks, can be seen on the surfaces of fallen blocks. The wave ripples resemble those found on sandy beaches and the desiccation cracks reflect periods of drying. In vertical faces (around the corner) caliche can be seen \u2014 this is a hard material made up of calcium carbonate that forms within a soil under dry conditions similar to the Mediterranean today. <\/p>\n\n\n\n<p>This combined evidence suggests that, during the early Carboniferous Period, the area was a swampy environment of shallow lagoons with a semi-arid climate; very different conditions to those in Edinburgh today! Sediments deposited in this environment form the sedimentary rocks that underlie much of the city.<\/p>\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\/wp-content\/uploads\/2021\/07\/sedFeaturesCamstone.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 2&lt;\/strong&gt;\u00a0 Sedimentary features exposed in blocks on the floor of Camstone Quarry, including wave ripples (left) and desiccation cracks (right). BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_90042\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/sedFeaturesCamstone-960x391.jpg\" class=\"attachment-medium size-medium\" alt=\"Preserved sand ripples on a brown block of rock with a geologicl hammer restine on it for a sense of scale, and preserved hexagon-shaped mud cracks in a grey rock, again with a hammer for scale\" \/><\/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\/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><strong>Figure 2<\/strong>\u00a0 Sedimentary features exposed in blocks on the floor of Camstone Quarry, including wave ripples (left) and desiccation cracks (right). BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/sedFeaturesCamstone.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 2&lt;\/strong&gt;\u00a0 Sedimentary features exposed in blocks on the floor of Camstone Quarry, including wave ripples (left) and desiccation cracks (right). BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_90042\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/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\">Locality 2: St Anthony&#8217;s Chapel<\/h2>\n\n\n\n<p>After the start of the Carboniferous Period around 342 million years ago, volcanic activity began and lava erupted at Arthur\u2019s Seat and spread across the landscape. At St Anthony\u2019s Chapel (Locality 2) an excellent exposure of the volcanic rocks of the Arthur&#8217;s Seat Volcanic Formation can be seen. These are dark, basaltic rocks formed by the rapid cooling of lava flows. The basalt found at St Antony\u2019s Chapel is part of a thick sequence that is thought to have erupted from a vent located where Edinburgh Castle stands today. <\/p>\n\n\n\n<p>Underneath the basalt are layers of dark green rock containing black fragments, which are a deposit of volcanic ash. Volcanic ash forms during explosive volcanic eruptions when the lava interacts with water. The ash falls to the ground, forming a layer blanketing the surrounding landscape. In some places, plant remains can be seen between the layers of ash.<\/p>\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\/wp-content\/uploads\/2021\/07\/St-Anthonys-Chapel.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 3a&lt;\/strong&gt;\u00a0 Exposed section beneath St Anthony\u2019s Chapel of an igneous rock called basalt that sits on green volcanic ash. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_38818\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/St-Anthonys-Chapel.jpg\" class=\"attachment-medium size-medium\" alt=\"A low cliff with reddish blocky basalt above a sharp contact, marked by a dotted line, with greenish fine ash. There is graffiti on the rock face and a geological hammer for scale.\" \/><\/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\/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><strong>Figure 3a<\/strong>\u00a0 Exposed section beneath St Anthony\u2019s Chapel of an igneous rock called basalt that sits on green volcanic ash. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/St-Anthonys-Chapel.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 3a&lt;\/strong&gt;\u00a0 Exposed section beneath St Anthony\u2019s Chapel of an igneous rock called basalt that sits on green volcanic ash. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_38818\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/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\/wp-content\/uploads\/2021\/07\/plant_remains.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 3b&lt;\/strong&gt;\u00a0 Plants remains in ash. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_38818\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/plant_remains.jpg\" class=\"attachment-medium size-medium\" alt=\"A close up of pale-coloured ash, with small black plant remains on the surface. There is a geological hammer for scale lying on the rock.\" \/><\/a><figcaption class=\"caption sm-line\">\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\/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><strong>Figure 3b<\/strong>\u00a0 Plants remains in ash. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/plant_remains.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 3b&lt;\/strong&gt;\u00a0 Plants remains in ash. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_38818\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/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\">Locality 3: Arthur&#8217;s Seat volcanic vent<\/h2>\n\n\n\n<p>In the centre of the park, near the bottom of Arthur\u2019s Seat at Locality 3, you can see an exposure of agglomerate. This outcrop represents the edge of the original Arthur\u2019s Seat volcanic vent. The agglomerate is made up of pieces of basalt surrounded by a fine-grained matrix and was formed by the accumulation of volcanic bombs and debris within the Arthur\u2019s Seat volcanic vent. This vent and the rocks above (forming the Lion\u2019s Head and Haunch) represent the core of the Arthur\u2019s Seat volcano. Erosion has long since removed the outer volcanic cone. &nbsp;<\/p>\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\/wp-content\/uploads\/2021\/07\/agglomerate.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 4&lt;\/strong&gt;\u00a0 The volcanic agglomerate found at the base of Arthur\u2019s Seat, with volcanic bombs sitting in a fine-grained matrix. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_59531\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/agglomerate.jpg\" class=\"attachment-medium size-medium\" alt=\"Large blocks of brownish rock in a finer brown rock in the foreground with the peak of Arthur&#039;s Seat hill in the background\" \/><\/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\/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><strong>Figure 4<\/strong>\u00a0 The volcanic agglomerate found at the base of Arthur\u2019s Seat, with volcanic bombs sitting in a fine-grained matrix. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/agglomerate.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 4&lt;\/strong&gt;\u00a0 The volcanic agglomerate found at the base of Arthur\u2019s Seat, with volcanic bombs sitting in a fine-grained matrix. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_59531\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/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\">Locality 4: Hutton&#8217;s Section, Salisbury Crags<\/h2>\n\n\n\n<p>There is an excellent view of the Edinburgh landscape from the top of Salisbury Crags.&nbsp;The bold cliff line of Salisbury Crags is itself a prominent feature of the Edinburgh skyline. To the east, the slope from the top of the crags dips smoothly eastwards towards Arthur&#8217;s Seat.&nbsp;<\/p>\n\n\n\n<p>The crags are thought to have been formed by a horizontal igneous intrusion of dolerite called the Salisbury Crag Sill, which formed after the main lavas and the volcanic vent at Arthur\u2019s Seat. In the late 18th century, James Hutton recognised that the molten igneous rock had intruded into the existing sedimentary rocks to form the dolerite. The world-famous Hutton\u2019s Section close to the crags shows this contact between the dolerite and the Carboniferous sedimentary rocks. <\/p>\n\n\n\n<p><strong>Please note Locality 4 where Hutton\u2019s Section can be seen is currently not accessible due to the slope instability on the front of Salisbury Crags and all access is cordoned off.<\/strong><\/p>\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\/wp-content\/uploads\/2021\/07\/huttons_section.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 4&lt;\/strong&gt;\u00a0 The world-famous Hutton\u2019s Section where molten dolerite has intruded into sedimentary rocks causing the buckling of the strata. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_45365\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/huttons_section.jpg\" class=\"attachment-medium size-medium\" alt=\"A low cliff with reddish rock above a dark grey rock. The dark grey rock is buckled and broken by the red rock. There is a geological hammer resting on the grey rock for scale. The contact between the two rock types is marked with a dotted line.\" \/><\/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\/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><strong>Figure 4<\/strong>\u00a0 The world-famous Hutton\u2019s Section where molten dolerite has intruded into sedimentary rocks causing the buckling of the strata. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/huttons_section.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;&lt;strong&gt;Figure 4&lt;\/strong&gt;\u00a0 The world-famous Hutton\u2019s Section where molten dolerite has intruded into sedimentary rocks causing the buckling of the strata. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_45365\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/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\">Locality 5: Samson&#8217;s Ribs<\/h2>\n\n\n\n<p>For the final location on the walk, head down to Duddingston Road to Locality 5. Looking up towards the hillside from the road, you will see a vertical face with tall, hexagonal columns of dark grey rock. These are called Samson\u2019s Ribs. The rock is basalt, similar to the rocks at St Anthony\u2019s Chapel; here however, it is thought that the molten lava ponded up in a surface hollow rather than flowing as a thin sheet across the land surface. The hexagonal columns form when a particularly thick layer of lava on the surface cools slowly.<\/p>\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\/wp-content\/uploads\/2021\/07\/SamsonsRibs.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Columnar jointing in basalt at Samson&#8217;s Ribs. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_81960\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/SamsonsRibs-960x752.jpg\" class=\"attachment-medium size-medium\" alt=\"A high cliff formed of subvertical pillars or columns of brownish grey rock\" \/><\/a><figcaption class=\"caption sm-line\">\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\/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>Columnar jointing in basalt at Samson&#8217;s Ribs. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/SamsonsRibs.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Columnar jointing in basalt at Samson&#8217;s Ribs. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_81960\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/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<p>After volcanic activity stopped, millions of years of slow erosion stripped away hundreds of metres of rock, removing most of the volcanic cone that would have crowned the volcano. Over the past two million years, glacial erosion has played a significant part in scouring the landscape. During the last major glaciation of Scotland, around 31&nbsp;000 to 16&nbsp;000 years ago, large ice streams sourced from Highlands and Southern Uplands flowed east across Edinburgh and the Lothians towards the area now occupied by the North Sea. The scouring of the ice removed the softer country rocks and shaped the hard, igneous rocks from the volcanoes core into the landscape we see today. <\/p>\n\n\n\n<p>Duddingston Loch, located to the to the east of Locality 5, is formed in the hollow eroded as ice flowing from the west was deflected around the hard protrusions of Salisbury Crags and Arthur\u2019s Seat.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Innocent Railway<\/h2>\n\n\n\n<p>If you have time, you can walk back to St Leonards via the tunnel that forms part of the The Innocent Railway path.&nbsp;This tunnel was originally constructed to take horse-drawn wagons, running on rails, bringing coal into the city of Edinburgh from coal mines to the east.&nbsp;It was the first railway tunnel in Scotland and the station the railway terminated at (now a modern residential development) was the first railway station in Edinburgh. The Edinburgh and Dalkeith Railway was commonly referred to as the Innocent Railway due to the wagons being horse drawn and perceived at the time to be safer than steam trains.&nbsp; <\/p>\n\n\n\n<p>More information on the Innocent Railway can found on the <a href=\"https:\/\/blog.historicenvironment.scot\/2021\/02\/innocent-railway\/\">Historic Environment Scotland website<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">More information<\/h2>\n\n\n\n<p>There are a number of resources available with further information on Arthur&#8217;s Seat and Holyrood Park:<\/p>\n\n\n\n<ul><li><a href=\"http:\/\/www.edinburghgeolsoc.org\/publications\/geological-excursion-guides\/#discovering-edinburghs-volcano\" target=\"_blank\" rel=\"noreferrer noopener\">Discovering Edinburgh\u2019s Volcano leaflet<\/a> Edinburgh Geological Society<\/li><li><a href=\"http:\/\/geowalks.co.uk\/\" target=\"_blank\" rel=\"noreferrer noopener\">Geowalks<\/a><\/li><li><a href=\"http:\/\/www.dynamicearth.co.uk\" target=\"_blank\" rel=\"noreferrer noopener\">Dynamic Earth<\/a> Science Centre (located at the edge of Holyrood Park)<\/li><li>Historic Environment Scotland <a href=\"http:\/\/www.historicenvironment.scot\/learn\/learning-resources\/teaching-resources\/#site-guides_tab\" target=\"_blank\" rel=\"noreferrer noopener\">site guide for teachers<\/a> (Holyrood Park)<\/li><\/ul>\n\n\n\t\t<h2>About the author<\/h2>\n\t\t<div>\n\t\t\t<div class=\"cards cards-contact no-shape\">\n\t\t\t\t\t\t\t\t<div class=\"media-wrap\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/03\/Romesh-Palamkumbura-150x150.jpg\" class=\"lazy-blur wp-post-image\" alt=\"Romesh Palamakumbura\" data-src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/03\/Romesh-Palamkumbura.jpg\" \/>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"info-wrap\">\n\t\t\t\t\t<div class=\"info\">\n\t\t\t\t\t\t<h5>Dr Romesh Palamakumbura<\/h5>\n\t\t\t\t\t\t<p>Geologist<\/p>\n\t\t\t\t\t\t<div>BGS Edinburgh<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/people\/palamakumbura-romesh\/\">Find out more<\/a>\n\t\t<\/div>\n\t\t\t\n\n\t\t\t<div class=\"relatives\">\n\t\t\t\t<h5>Relative topics<\/h5>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/tag\/postcard-geology\/\" class=\"button primary-background\">postcard geology<\/a>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<\/div><\/div><\/div><\/section>\n\n\n\t\t\t\t\t<section   id=\"latest-content-9601-block_608869028b6f7\" class=\"grid-section  primary-background   \" >\n\t\t\t\t\t\t<div class=\"container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"row header-of-section\">\n\t\t\t\t\t\t\t\t<div class=\"col-12\">\n\t\t\t\t\t\t\t\t\t<h2>You may also be interested in<\/h2>\n\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\t\t\t\t\t\t\t\t<div class=\"row grid-wrap\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"col-lg-6 col-12\">\n\t<div class=\"cards cards-orizontal-sm  cards-find-more  cards-bordered\">\n\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/\" class=\"media-wrap\">\n\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/04\/feature_homepage_p815563-150x150.jpg\" class=\"lazy-blur wp-post-image\" alt=\"Ammonite p815563\" data-src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/04\/feature_homepage_p815563.jpg\" \/>\t\t\t\t\t<\/a>\n\t\t\t\t<div class=\"info-wrap\">\n\t\t\t<div class=\"info\">\n\t\t\t\t<h4><a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/\">Discovering Geology<\/a><\/h4>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p>Discovering Geology introduces a range of geoscience topics to school-age students and learners of all ages.<\/p>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/\">Show more<\/a>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n<div class=\"col-lg-6 col-12\">\n\t<div class=\"cards cards-orizontal-sm  cards-find-more  cards-bordered\">\n\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/\" class=\"media-wrap\">\n\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/06\/Maps_and_resources_feature-150x150.jpg\" class=\"lazy-blur wp-post-image\" alt=\"Maps and resources feature image P542895\" data-src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/06\/Maps_and_resources_feature.jpg\" \/>\t\t\t\t\t<\/a>\n\t\t\t\t<div class=\"info-wrap\">\n\t\t\t<div class=\"info\">\n\t\t\t\t<h4><a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/\">Maps and resources<\/a><\/h4>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p>Download and print free educational resources.<\/p>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/\">Show more<\/a>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n<div class=\"col-lg-6 col-12\">\n\t<div class=\"cards cards-orizontal-sm  cards-find-more  cards-bordered\">\n\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/\" class=\"media-wrap\">\n\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/Scarborough_headland-150x150.jpg\" class=\"lazy-blur wp-post-image\" alt=\"Scarborough Castle headland\" data-src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2021\/07\/Scarborough_headland.jpg\" \/>\t\t\t\t\t<\/a>\n\t\t\t\t<div class=\"info-wrap\">\n\t\t\t<div class=\"info\">\n\t\t\t\t<h4><a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/\">Postcard geology<\/a><\/h4>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p>Find out more about sites of geological interest around the UK, as described by BGS staff.<\/p>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/\">Show more<\/a>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"row\">\n\t\t\t\t\t\t\t\t<div class=\"col-12\">\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\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\t\t\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A short walk around Holyrood Park provides an insight into the geological history of area from the Carboniferous Period to now.<\/p>\n","protected":false},"author":9,"featured_media":75082,"parent":71982,"menu_order":9,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"on","_relevanssi_pin_keywords":"arthur's seat, edinburgh","_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":"50567,37440,62204,37431,8435,37384","_relevanssi_noindex_reason":"","footnotes":""},"tags":[1070],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Geology of Arthur&#039;s Seat - British Geological Survey<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bgs.ac.uk\/discovering-geology\/maps-and-resources\/office-geology\/geology-of-arthurs-seat\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Geology of Arthur&#039;s Seat - 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