Cliffs at Hunstanton showing 3 layers of rock

Cliffs at Hunstanton showing 3 layers of rock

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Credit: DR JEREMY BURGESS/SCIENCE PHOT LIBRARY.

Caption: Cliffs at Hunstanton, Norfolk showing three distinct layers of rock; nearest the beach is Carstone (40-58ft, 12-17m thick), thin layer of Red Rock (4ft 1.2m) topped by Cenomanian chalk (18ft, 5.5m). Carstone (ginger brown) is a coarse & gritty sandstone from the Lower Cretaceous. It contains large quantities of iron & the minerals kyanite, staurolite, tourmaline, rutile & zircon. The stratum of Red Rock (young lower Cretaceous) is a continuation of the Gault Clay & consists of a pink ferruginous (iron) limestone layer with peebles scattered in it. The Cenomanian chalk layer (Upper Cretaceous) contains fine calcite crystals, making this chalk harder than average.

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Keywords: carstone, cenomanian chalk, chalk, earth science, gault clay, geology, limestone, red rock, rock strata, sandstone

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