The regional geochemical baseline data is important in order to understand our environment and to measure changes, whether they be natural or man-made. This baseline data of the surface environment also allows us to model the migration of elements and provides a reference point against which we can monitor change.
Stream sediments are our primary sample media and have been collected strategically since the beginning of the project in 1968. The project has covered the UK landmass as far as the River Thames at an average drainage density of 1 site per 1.5 to 2 km sq. The sediment is collected from the centre of the stream and is sieved through two sieves to a grain size less than 150 µm. Excess material from the < 2mm fraction is panned to collect a heavy mineral concentrate.
Details on the sampling procedures are described in a field procedures manual – to find a copy, please go to downloads.
A selection of regional geochemical maps of elements Ba, Cu, Fe, K, Mg, Mn, Ni, Pb, U, V and Zn in stream sediments are listed below.
Soils are very important sample media and have great relevance to recent environmental and soil protection policies. The adjacent map shows the current extent of G-BASE soil sample sites in the UK, including the distribution of urban soil sample sites.
Visit BGS Onshore Geoindex to search for individual soil sample location of the urban areas sampled so far. Make sure the map theme is set to Geochemistry (top right hand corner) and one or all of the sample media are selected in the left hand panel.
Alternatively go to G-BASE enquiries for data sales and products.