G-BASE Profile Soil
G-BASE Topsoil

Geochemical Baseline Survey of the Environment (G-BASE)

The Geochemical Baseline Survey of the Environment (G-BASE) is a major British Geological Survey campaign of geochemical sampling across many parts of the UK. The core function is to provide a national capability in baseline geochemical analysis of water samples, stream sediment and soils. We are currently preparing a range of new maps and free-to-download data from G-BASE for the UKSO. These maps and data will be available soon.

See G-BASE regional geochemical mapping for further information on the areas that have been sampled between 1985 and 2013 and how to acquire this data.

The Geochemical Baseline Survey of the Environment (G-BASE) is a major BGS campaign of geochemical sampling across many parts of the UK. The core function is to provide a national capability in baseline geochemical analysis of water samples, stream sediment and soils.

Beginning in the late 1960s, the primary focus was mineral exploration, however the project has now evolved into a multi-media, high-resolution geochemical survey producing baseline data relevant to many environmental issues. G-BASE is a project within the Geochemical Baselines and Medical Geology Team area. Its main activities can be classified as either Regional or Urban geochemical baseline mapping. Recent work has focused on the geochemical mapping of London.

The regional Geochemical Baseline Survey of the Environment (G-BASE) project has collected samples at a density of one sample per 2 km2; from mostly agricultural fields. Each sample site has a surface (5-20 cm) and a profile (35-50 cm) sample. Inorganic analytical data are available for over 50 determinands.

See G-BASE regional geochemical mapping for further information on the areas that have been sampled between 1985 and 2013 and how to acquire this data.

High density soil geochemical data are also available for 25 major cities and towns of Great Britain. Soil samples were collected as part of the Geochemical Baseline Survey of the Environment (G-BASE) project at a density of four sites per 1 km2 within the build-up areas. At each sampling site a surface (5-20 cm) and a profile (35-50 cm) sample were collected (and a third topsoil sample from 0-2 cm across Greater London).

See G-BASE urban geochemical mapping for further information on the areas that have been sampled between 1993 and 2013 and how to acquire this data.

Click on a gallery image to view high resolution images and discover further information about the geochemical baseline survey of England and Wales.