MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Cliffs at Hunstanton, Norfolk, showing three distinct layers of rock. At the bottom is Carstone (ginger brown), a coarse and gritty sandstone from the Lower Cretaceous. The central stratum of Red Rock is from the young Lower Cretaceous. At top is Lower Chalk (Upper Cretaceous), which contains fine calcite crystals, making this chalk harder than average.
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