Parent Material Grain Size

The map covers Great Britain and integrates geology and soil characteristics at a scale of 1:50 000 (visible at higher zoom levels), with a 1km resolution version available for regional overview.

This is a generalized textural description of the Parent Material. The grain size values are derived from known sample measurements and expert judgement (based on field survey and description of the deposits). Where a parent material comprises more than one type of deposit a range of values is given. Deposits that are known to be heterolithic (i.e. consisting of a lithology comprising a wide range of grain sizes) are identified by the term 'mixed'. Note that geologists use different grain size descriptions for rocks derived from sedimentary and igneous origin. The following values are given in the dataset.

These data are made available under the Open Government Licence, subject to the following acknowledgement accompanying the reproduced BGS materials: "Contains British Geological Survey materials © NERC [year]".

Parent Material Grain Size map legend

Map legend

Key Term used
RUDACEOUS
ARENACEOUS - RUDACEOUS
ARENACEOUS
ARGILLIC - ARENACEOUS
ARGILLACEOUS
MIXED (ARENACEOUS - RUDACEOUS)
MIXED (ARGILLIC - RUDACEOUS)
MIXED (ARGILLIC - ARENACEOUS)
PEAT
COARSE
MEDIUM
FINE
NOT APPLICABLE
Title Parent Material Grain Size
Source British Geological Survey
Enquiries BGS Enquiries
Scale(s) 1:50 000 and 1km grid resolution
Coverage Great Britain
Format GIS polygon data. (ESRI, MapInfo, others available by request)
Price 30p per km2 for commercial use of 1:50 000 scale data. Subject to licence fee and data preparation fee. More information about licensing data.
The 1 km grid data is free for use under Open Government Licence terms.
Uses Local to national level use
Downloads Free 1km grid data and sample 1:50 000 scale data
Map Viewer View in UKSO Map Viewer
WMS link https://map.bgs.ac.uk/arcgis/services/
UKSO/UKSO_BGS/MapServer/WMSServer?
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