1Relating to or denoting the second epoch of the Tertiary period, between the Paleocene and Oligocene epochs.
- It includes the Palaeocene, Eocene, and Oligocene epochs, spanning the time from the end of the Mesozoic to the beginning of the Neogene.
- An early Cretaceous to late Eocene volcanic arc was located in the present-day Central Depression.
- Western Ecuador consists of a complex tectonic melange of oceanic terranes accreted to the continental margin from Late Cretaceous to Eocene time.
Mid 19th century: from Greek ēōs 'dawn' + kainos 'new'.
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