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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 3720 stream sediment samples collected at an average density of one per 2.5 km² 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 10 km. Cell size is 500 m. Detailed information on sampling and analytical methods are provided in the following published geochemical atlas:

Everett, P A, Lister, T R, Fordyce, F M, Ferreira, A M P J, Donald, A W, Gowing, C J B, and Lawley, R S. 2019. .��British Geological Survey Open Report OR/18/048. (Nottingham, UK: British Geological Survey.) Link: https://nora.nerc.ac.uk/id/eprint/524956/

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