This Web service provides geophysical log data held by the British Geological Survey (BGS) within the National Geoscience Data Centre (NGDC). Two layers are provided. The 'geophysical logs' layer is an index into the boreholes for which BGS holds digital and hard-copy geophysical log data. Metadata about each borehole are included, as well as a link to where digital geophysical log data may be downloaded, where available. The 'geophysical logs - onshore hydrocarbon wells' layer is a subset of the 'geophysical logs' layer which includes only onshore hydrocarbon well boreholes.