Limestone cobbles on shale

Limestone cobbles on shale

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Limestone cobbles on an eroded shale platform. The cobbles (light grey) are blocks that have eroded away from a limestone platform (at top), which forms a layer on top of the shales (dark grey). The limestone and shale strata alternate. Limestone is a sedimentary rock formed from calcium minerals such as calcium carbonate. Shales contain clay minerals and quartz. Oil can be obtained from shales by methods such as fracking. Photographed in Bridgewater Bay, Somerset, UK.

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Keywords: beach, bridgewater bay, britain, british, calcium carbonate, clay minerals, close-up, coast, coastal benches, cobble, cobbles, deposit, detail, earth science, england, english, eroded, erosion, europe, european, fossil fuels, geological, geology, limestone, limestone pavement, limestone platform, oil bearing, pebbles, physical geography, rock, rocky, seashore, sedimentary, shale, shale platform, shore, shore platform, somerset, stones, strata, uk, united kingdom, wave action, wave erosion, wave-cut

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