DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Mudstone and shale cliff, Kimmeridge Bay, Dorset, UK. This view shows the rock strata and alternating layers of bitumous shale (grey) and calcareous mudstone (brown). Cliffs such as this are hazardous due to loose shales and the risk of rockfalls. This area is part of the Jurassic Coast Heritage Site. It is rich in oil and fossils. The Kimmeridge Clay Formation is composed of mudstones and shales. The fossils include shells of ammonites and bivalves, and the bones of marine reptiles, dinosaurs and pterosaurs. Some of the shales are rich in oil, with pumps used to extract oil from depths of around 550 metres.
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