Eocene in a sentence

At the end of the Middle Eocene Climatic Optimum, cooling and the carbon dioxide drawdown continued through the late Eocene and into the Eocene-Oligocene transition around 34 million years ago.

And, as we now know, that is what did happen over large areas of North America from the Eocene to the Pleistocene : the ultimate causative agent was global temperature reduction (see Paleocene–Eocene Thermal Maximum ).

Comparing the early Eocene production of methane to current levels of atmospheric methane, the early Eocene would be able to produce triple the amount of current methane production.

Cooling continued throughout the rest of the late Eocene into the Eocene-Oligocene transition.

Fauna Crassostrea gigantissima (Finch, 1824), a giant oyster from the Eocene of Texas Fossil nummulitid foraminiferans showing microspheric and megalospheric individuals; Eocene of the United Arab Emirates ; scale in mm.

Following the maximum was a descent into an icehouse climate from the Eocene Optimum to the Eocene-Oligocene transition at 34 million years ago.

Hyperthermals through the Early Eocene During the warming in the Early Eocene between 52 and 55 million years ago, there were a series of short-term changes of carbon isotope composition in the ocean.

A team of paleontologists has announced the discovery of an Eocene-era whale it may be the heaviest animal to ever live, surpassing the extant blue whale in mass.

The impact event and Paleocene-Eocene Thermal Maximum were, ironically, fortuitous for humans: They paved the way for our ancestors.

Zenaida is an early-stage exploration group of concessions comprising 1,800 ha, and is also located on the Upper Eocene-Lower Oligocene (Mid-Tertiary) Metallogenic Belt, sharing some similarities to the geology in the Collahuasi region (" ").

It was at the end of the Palaeocene - beginning of the Eocene, subdivisions of the Palaeogene, that they migrated, thanks to the warmer climate at that time, and spread to what is now Europe and Asia.

The main factor behind the divergence in feeding strategies was probably a dramatic cooling of ocean waters during the transition from the Eocene to the Oligocene epoch, about 34 million years ago.

Although marsupials and placental mammals did coexist in Australia in the Eocene, only marsupials have survived to the present.

An unnamed fossil from Argentina proves that, by the Bartonian (Middle Eocene ), some 39–38 mya, Contra Baker et al.

A sharp increase in atmospheric carbon dioxide was observed with a maximum of 4000 ppm: the highest amount of atmospheric carbon dioxide detected during the Eocene.

At about the beginning of the Eocene Epoch (55.8-33.9 million years ago) the amount of oxygen in the earth's atmosphere more or less doubled.

At the beginning of the Eocene, several new mammal groups arrived in North America.

At the beginning of the middle Eocene an event that may have triggered or helped with the draw down of carbon dioxide was the Azolla event at around 49 million years ago.

At the beginning of the Upper Eocene the Brontotheroidea, which were almost exclusively confined to North America and Asia, died out.

By the Late Eocene (46 million years ago), the three modern suborders had already developed: Suina (the pig group); Tylopoda (the camel group); and Ruminantia (the goat and cattle group).