Definitions for eoceneˈi əˌsin
This page provides all possible meanings and translations of the word eocene
Eocene, Eocene epoch(noun)
from 58 million to 40 million years ago; presence of modern mammals
the Eocene epoch
of a geologic epoch within the Paleogene period from about 56 to 34 million years ago.
pertaining to the first in time of the three subdivisions into which the Tertiary formation is divided by geologists, and alluding to the approximation in its life to that of the present era; as, Eocene deposits
the Eocene formation
Origin: [Gr. 'hw`s daybreak, dawn + new, recent.]
The Eocene epoch, lasting from 56 to 33.9 million years ago, is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Palaeocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope ¹³C in the atmosphere was exceptionally low in comparison with the more common isotope ¹²C. The end is set at a major extinction event called the Grande Coupure or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods, the strata that define the start and end of the epoch are well identified, though their exact dates are slightly uncertain. The name Eocene comes from the Greek ἠώς and καινός and refers to the "dawn" of modern fauna that appeared during the epoch.
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