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Bioclastic, oyster-bound clasts of well-cemented patch reef in a matrix of shelly oosparite – Many large grey and white oyster shell fragments. Patch reefs were formed by masses of oysters and bryozoans cemented around a massive calcareous laminated framework built of the red alga Solenopora.
The shells are randomly distributed throughout the stone.
Texture is typically coarse with some vuggy patches.
Typical Portland colour - variable light to dark grey, the colour varying with the density of included shell.
Albion Stone plc, Robert Denholm House, Bletchingley Road, Nutfield, Surrey, RH1 4HW
