Eocene

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Concise Oxford English Dictionary © 2008 Oxford University Press:
Eocene /ˈiːə(ʊ)siːn/

▶adjective Geology relating to or denoting the second epoch of the Tertiary period (between the Palaeocene and Oligocene epochs, 56.5 to 35.4 million years ago), a time when the first horses, bats, and whales appeared.

– origin C19: from Gk ēōs ‘dawn’ + kainos ‘new’.

'Eocene' also found in these Oxford entries:

hyracotherium - London clay - Oligocene - Palaeocene - Palaeogene

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Eocene