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

Name: The white cliffs of Dover are chalk-like deposits of coccolithophores and are around 100 million years old.
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The white cliffs of Dover are indeed made up of chalk-like deposits, but they are actually around 65 million years old, formed from the remains of coccolithophores, microscopic algae that lived in the warm, shallow sea that covered much of the UK during the Late Cretaceous period.

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