A very pure limestone from the Upper Cretaceous. Related Articles: Real ‘Southend Rock’Field trip to the building stones of CanterburyCoccoliths: Tiny fossils with immense paleontological importanceBook review: The Isle of Wight (Geologists’ Association Guide No 60), by Andy GaleBook review: Logging the Chalk, by Rory N Mortimore« Back to Glossary Index