This Web service provides a spatial index into the BGS collection of onshore borehole materials in the UK and the Isle of Man, including drillcore, bulk specimens, washed and unwashed cuttings and processed material. The boreholes have been drilled by BGS, or by commercial or public bodies. The name of the borehole, its unique reference code and number (BGS_ID) and the type of material is provided. For some boreholes, multiple types of material are available. Details of the collection are held in the Borehole Materials Database, and may be accessed via the BGS website.