Peak District views by @jackwtjordan
About 340 million years ago, the area which is now the Peak District was covered by a warm, clear, shallow sea. The sea was full of microscopic shell-creatures, and on the sea bed there were several coral reefs and beds of shellfish some of which were similar to modern cockles, as well as many other types. There were also beds of crinoids, animals related to starfishes, which had stalks made up of rings of calcium carbonate.
Over a long period, millions of years, these creatures lived and died in the area, laying down a thick bed of calcium which has helped shape the landscape today.
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