Eocene-Oligocene extinction event
- Eocene-Oligocene extinction event
The transition between the end of the Eocene and the beginning of the Oligocene, occurring 33.9 ± 0.1 Ma, is marked by large-scale extinction (although minor in comparison to the largest mass extinctions).
Most of the affected organisms were marine or aquatic in nature. They included the last of the ancient cetaceans, the Archaeoceti.
This was a time of major climatic change, not obviously linked with any single major impact or any major volcanic event. One cause of the extinction event is speculated to be volcanic activity. Another speculation is that the extinctions are related to several meteorite impacts that occurred about this time. One such event happened near present-day Chesapeake Bay, and another in Central Siberia, scattering debris perhaps as far as Europe.http://www.ucmp.berkeley.edu/education/events/cowen1a.html
Wikimedia Foundation.
2010.
Look at other dictionaries:
Extinction event — … Wikipedia
Grande coupure Éocène-Oligocène — La grande coupure Éocène Oligocène ou extinction de masse de la fin de l Éocène est la courte période de transition entre la fin de l Éocène et le début de l Oligocène qui a eu lieu il y a eu 33,9 ± 0,1 Ma, et est marquée par l extinction à… … Wikipédia en Français
Eocene — System Series Stage Age (Ma) Neogene Miocene Aquitanian younger Paleogene Oligocene … Wikipedia
Oligocene — System Series Stage Age (Ma) Neogene Miocene Aquitanian younger Paleogene Oligocene … Wikipedia
Archaeoceti — Taxobox name = Archaeoceti fossil range = Eocene to Miocene (non Autocetan) image width = 250px image caption = Pakicetus, one of the very first archeocetids regnum = Animalia phylum = Chordata classis = Mammalia ordo = Cetacea subordo =… … Wikipedia
Grande Coupure — Als Grande Coupure wird in der Paläontologie ein bedeutender Faunenaustausch bezeichnet, der sich an der Wende Oligozän (Grenze Priabonium/Rupelium) ereignete. Dieser Einschnitt war mit einer Klimaverschlechterung und einem großen Artensterben… … Deutsch Wikipedia
Climate of India — … Wikipedia
Эоцен-олигоценовое вымирание — … Википедия
Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene … Universalium
Evolution of the horse — This image shows a representative sequence but should not be construed to represent a straight line evolution of the horse. Reconstruction, left forefoot skeleton (third digit emphasized yellow) and longitudinal section of molars of selected… … Wikipedia
