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Gault clay, a pale to dark grey or blue-grey mudstone from the Cretaceous.
Gault Clay is a deep water marine mudstone belonging to the Albian stage of the Lower Cretaceous. It contains locally abundant fossils such as ammonites, bivalves, belemnites & brachiopods. It is pale to dark grey or blue-grey in colour. In places it is glauconitic i.e. it contains iron potassium phyllosilicate, a type of mica. It has been widely extracted for the manufacture of bricks. This example was collected from Beare Green near Dorking, Surrey. Specimens are supplied in labelled card trays.