from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or belonging to the geologic time, rock series, or sedimentary deposits of the second epoch of the Tertiary Period, characterized by warm climates and the rise of most modern mammalian families. See Table at geologic time.
  • n. The Eocene Epoch or its system of deposits.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of a geologic epoch within the Paleogene period from about 56 to 34 million years ago.
  • n. the Eocene epoch

from the GNU version of the Collaborative International Dictionary of English

  • adj. 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.

from The Century Dictionary and Cyclopedia

  • Literally, of the dawn of the recent: applied in geology to one of the divisions of the Tertiary, as originally suggested by Lyell.
  • In paleontology, having existed in this geological period: said of animals whose remains occur in the Eocene.
  • n. In geology, a division of the Tertiary. See Tertiary.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. from 58 million to 40 million years ago; presence of modern mammals


Sorry, no etymologies found.


  • And finally, the highest horizon is called Eocene and is 1500 meters below the bottom of the sea.

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  • One of the major implications of this reassignment is that, because Papuacedrus is known from tropical montane habitats and is physiologically limited to extremely wet climates, it adds to the emerging evidence that Patagonia in the Eocene was a warm, wet tropical place and not a cold, dry steppe as much of it is today.

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  • Yesterday, I finished reading "Eotheroides lambondrano, new middle Eocene seacow (Mammalia, Sirenia) from the Mahajanga Basin, northwestern Madagascar."

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  • Hans Thewissen of the Northeastern Ohio Universities Colleges of Medicine and Pharmacy recovered the skeleton in rocks from Kashmir, a disputed region between India and Pakistan, where the deer-like herbivore lived during the Eocene epoch, 56 to 34 million years ago.

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  • Eocene uses the Greek root for dawn, heralding the birth of modern mammals, and the root of holocene means wholly recent, referring to the epoch we've been in for the past 10,000 years.

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  • Prof. CLARKE: Well, I've thought about this: You know, what would it be like to be on an Eocene beach and see one of these guys come ashore?

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  • Prof. CLARKE: Well, it's quite possible that the, you know, there was quite a diversity of penguins in the Eocene, you know, early on in penguin evolution.

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  • Tagged with ecology, ocean acidification, mass extinction events, Paleocene-Eocene Thermal Maximum

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  • This is all the more remarkable because the great beasts are quite primitive, bearing anatomical characters directly traceable to the ancestral Eocene era ancestors from which Asian turtles sprang.

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  • A 1999 Journal of Molecular Evolutionstudy put the development of primates at 65 to 85 million years ago, but their fossils only turn up in numbers in the Eocene.

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