Digital Geological Map Data of Great Britain - 25k (DiGMapGB-25) Linear version 2

Dataset title Digital Geological Map Data of Great Britain - 25k (DiGMapGB-25) Linear version 2
Dataset creators British Geological Survey
Dataset theme Geoscientific Information
Dataset abstract

Linear features (shown as polylines) represent six classes of geological structural features e.g. faults, folds or landforms e.g. buried channels, glacial drainage channels at the ground or bedrock surface (beneath superficial deposits).

Linear features are associated most closely with the bedrock theme either as an intrinsic part of it for example marine bands or affecting it in the case of faults. However landform elements are associated with both bedrock and superficial deposits.

The linear features are organised into seven main categories:

Alteration area, indicating a zone of change to the pre-existing rocks due to the application of heat and pressure can occur round structural features such as faults and dykes.

Fault, where a body of bedrock has been fractured and displaced by a large scale process affecting the earth’s crust.

Fold, where strata are bent or deformed resulting from changes or movement of the earth’s surface creating heat and pressure to reshape and transform the original horizontal strata. Folds appear on all scales, in all rock types and from a variety of causes.

Fossil horizons, where prolific fossil assemblages occur and can be used to help establish the order in which deposits were laid down (stratigraphy). These horizons allow correlation where sediments of the same age look completely different due to variations in depositional environment.

Landforms, define the landscape by its surface form; these include glacial features such as drumlins, eskers and ice margins.

Mineral vein, where concentrations of crystallised mineral occur within a rock, they are closely associated with faulting but may occur independently.

Rock, identifies key (marker) beds, recognised as showing distinct physical characteristics or fossil content. Examples include coal seams, gypsum beds and marine bands.

The data are available in vector format (containing the geometry of each feature linked to a database record describing their attributes) as ESRI shapefiles and are available under BGS data licence.

Dataset content dates before 2008
Dataset spatial coverage Great Britain
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) 10.5285/3d907df9-1d85-4f8f-8a4f-8d2a78f7c2e7
Dataset citation text Digital Geological Map Data of Great Britain - 25k (DiGMapGB-25) Linear version 2 British Geological Survey 2008
Constraints and terms of use License
Access the dataset
Further information DiGMapGB–25 product