Rock strata exposed by erosion at the coast. Strata are formed when material is deposited over millions of years, and becomes compacted into rock by the weight of the overlying layers. The rocks were laid down during the Carboniferous period, between 345 and 280 million years ago. The boundary between the two types of strata here, the thick lower layers and the thin upper layers, is known as an unconformity. Photographed near Saunders Foot, Wales, UK.
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