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Part of the Geochemical Baseline Survey of the Environment (G-BASE) for south-west England.

This map is based on analysis of 1154 shallow (0.05 to 0.25 m) soil samples collected at varying densities (ranging from one per 2 km²to one per 5km², depending on underlying parent material) during the field campaigns of 2004 and 2012.

The image was generated in ArcGIS 10.1 using inverse distance weighting (IDW) of the nearest 12 samples within a variable search radius capped at 10km. Cell size is 500m. Detailed information on sampling and analytical methods are provided in the following published geochemical atlas:

Everett, P A,Lister, T R,Ferreira, A M P J, andFordyce, F M. 2023. .��51���� Open Report OR/22/037. (Nottingham, UK: 51����.) (OR/22/037). Link: https://nora.nerc.ac.uk/id/eprint/535963/

These data are delivered under the terms of the, subject to the following acknowledgement accompanying the reproduced BGS materials: "Contains 51���� materials © 51���� [year]".