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The foreign sliced rock or 'F' collection consists of about 10, 000 specimens and thin sections, cited by their 'F' numbers. These include material archived from recent overseas projects and much collected during the late 19th or early 20th Century from regions within what was then the British Empire. It also includes 'exotic' materials donated to the Survey in its earlier years. Its coverage varies, although there is a predominance of African material. It is indexed on paper registers, and approximately 20% has been input onto 'Britrocks'.
A collection of large-size, representative hand samples of building stones from current and historic quarries in the UK, together with specimens from historic buildings supplied by conservation architects and contractors, currently c.680 samples. The sample coverage extends across the whole of the UK and supplements material in the Keyworth BGS BRITROCKS collection (Petrological Collection Database). The data included with the samples includes quarry and building locations and relevant lithostratigraphic information. The collection is ongoing and new material is added on a regular basis. The collection was created to mitigate the massive gap in knowledge resulting from the non-transferral of the main BGS Building Stone Collection to Keyworth from the Geological Museum in London, when the original move by BGS from London took place. The samples have been collected to assist in the sourcing, identification and matching of buildings stones from historic buildings throughout the UK. The collection provides essential support for the numerous enquiries the BGS receives through its GEOREPORTS Building Stone Assessment programme.