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Portland limestone
Portland limestone is a limestone which was deposited in the latest stage of the Upper Jurassic period. It was first found on the Isle of Portland, Dorset.[1] However, it occurs over a much wider area, including France.
The strata are beds of white-grey limestone separated by beds of chert.
↑West, Ian 2012. Ian West's website on the Jurassic Coast and more. Includes the Isle of Portland and its surrounds. Soton.ac.uk