Digital Geological Map Data of Great Britain - 625k (DiGMapGB-625) 2008

Dataset title Digital Geological Map Data of Great Britain - 625k (DiGMapGB-625) 2008
Dataset creators British Geological Survey
Dataset theme Geoscientific Information
Dataset abstract

Data identifying landscape areas (shown as polygons) attributed with geological names. The scale of the data is 1:625 000 providing a simplified interpretation of the geology. Onshore coverage is provided for all of England, Wales, Scotland, the Isle of Man and Northern Ireland.

Data are supplied as four themes: bedrock, superficial deposits, dykes and linear features (faults).

Bedrock geology describes the main mass of solid rocks forming the earth’s crust. Bedrock is present everywhere, whether exposed at surface in outcrops or concealed beneath superficial deposits or water bodies. The bedrock theme defines landscape areas (shown as polygons) attributed with geological names.

Geological names are based on the lithostratigraphic or lithodemic hierarchy of the rocks. The lithostratigraphic scheme arranges rock bodies into units based on rock-type and geological time of formation.

Where rock-types do not fit into the lithostratigraphic scheme, for example intrusive, deformed rocks subjected to heat and pressure resulting in new or changed rock types; then their classification is based on their rock–type or lithological composition. This assesses visible features such as texture, structure, mineralogy.

Superficial deposits are younger geological deposits formed during the most recent geological time; the Quaternary. These deposits rest on older rocks or deposits referred to as bedrock. The superficial deposits theme defines landscape areas (shown as polygons) attributed with a geological name and their deposit–type or lithological composition.

The dykes theme defines small, narrow areas (shown as polygons) of a specific type of bedrock geology; that is igneous rocks which have been intruded into the landscape at a later date than the surrounding bedrock. They are presented as an optional, separate theme in order to provide additional clarity of the bedrock theme. The bedrock and dykes themes are designed to be used together.

Data identifying linear features (shown as polylines) represents geological faults at the ground or bedrock surface (beneath superficial deposits).

Geological faults occur where a body of bedrock has been fractured and displaced by large scale processes affecting the earth’s crust (tectonic forces). The faults theme defines geological faults (shown as polylines) at the ground or bedrock surface (beneath superficial deposits).

All four data themes are available in vector format (containing the geometry of each feature linked to a database record describing their attributes) as ESRI shapefiles and are delivered free of charge under the terms of the Open Government Licence.

Dataset content dates before 2008
Dataset spatial coverage United Kingdom
Dataset supply format ESRI shapefiles
Dataset language English
Dataset discovery metadata record Discovery Link to the dataset's BGS Discovery Metadata record.
Also available as ISO19115/19139 XML.
Dataset publisher British Geological Survey
Dataset publication date 2008
Dataset digital object identifer (DOI) 10.5285/d9c6923b-a339-48f7-b1cf-5c9bbb664ef5
Dataset citation text Digital Geological Map Data of Great Britain - 625k (DiGMapGB-625) British Geological Survey 2008
Constraints and terms of use This data set is available under Open Government Licence, subject to the following acknowledgement accompanying any reproduced materials: "Contains data supplied by permission of the Natural Environment Research Council © NERC [2014]".
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Further information DiGMapGB–625 product