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wood prints cliff wood prints chalk wood prints seven sisters wood prints sssi wood prints sussex wood prints coast wood prints coastline wood prints england wood prints calcium carbonate wood prints coastal wood prints coastlines wood prints

photographs cliff photos chalk photos seven sisters photos sssi photos sussex photos coast photos coastline photos england photos calcium carbonate photos coastal photos coastlines photos

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Chalk cliffs. View of Seven Sisters chalk cliffs in East Sussex, England. Grassland covers the tops of these near vertical cliffs. The chalk that now forms the cliffs was laid down about 80 million years ago during the late Cretaceous period. At this time high sea levels meant that a shallow ocean covered most of Southern Britain. Microscopic algae called coccolithophorids that lived in this ocean formed this chalk. Chalk is the compressed calcium carbonate skeletons of these algae. Seven Sisters chalk cliffs are a Site of Special Scientific Interest (SSSI). A SSSI is a UK site that is being conserved for scientific reasons.

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