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. However, it occurs over a much wider area, including France.
The strata are beds of white-grey limestone separated by beds of chert.
A: Portland limestone is a type of limestone that was deposited during the latest stage of the Upper Jurassic period.
A: Portland limestone was first found on the Isle of Portland, Dorset.
A: No, it occurs over a wider area, including France.
A: The beds of limestone in Portland limestone are white-gray.
A: The layers in Portland limestone are beds of white-grey limestone separated by beds of chert.
A: Portland limestone was deposited during the latest stage of the Upper Jurassic period.
A: Portland limestone is unique in its deposition period and location, and its distinctive layers of white-grey limestone separated by beds of chert.
