The white cliffs of Dover are chalk-like deposits of coccolithophores that are around 100 million years old.

Name: The white cliffs of Dover are chalk-like deposits of coccolithophores that are around 100 million years old.
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The white cliffs of Dover are composed of chalk, which is formed from the skeletal remains of coccolithophores, a type of plankton, and they date back to the Cretaceous period, around 100 million years ago.

The White Cliffs of Dover Are Chalk-Like Deposits of Coccolithophores