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The fossil record of marine mammals is a little spotty during this time, and not as well known as the Eocene or Miocene, but some fossils have been found. The baleen whales and toothed whales had just appeared, and their ancestors, the archaeocete cetaceans began to decrease in diversity due to their lack of echolocation, which was very useful ...
Oligocene Epoch, third and last major worldwide division of the Paleogene Period (65.5 million to 23 million years ago), spanning the interval between 33.9 million to 23 million years ago. The Oligocene Epoch is subdivided into two ages and their corresponding rock stages: the Rupelian and the Chattian .
Oligocen (ang. Oligocene) w sensie geochronologicznym: najmłodsza epoka paleogenu, trwająca około 11 milionów lat (od 33,9 do 23,03 mln lat temu). Oligocen jest młodszy od eocenu a starszy od miocenu. Dzieli się na dwa wieki: rupel i szat.
As with the preceding Eocene epoch, the most common fossil birds of the Oligocene epoch were predatory South American “terror birds” (such as the unusually pint-sized Psilopterus) and giant penguins that lived in temperate, rather than polar, climates–Kairuku of New Zealand being a good example.
14 sty 2016 · We report a new fossil species of Ptilocercus treeshrew recovered from the early Oligocene (~34 Ma) of China that represents the oldest definitive fossil record of the crown group of...
The Oligocene represents a low-point in the overall diversity of mammalian species, partly due to continued global cooling and reduced endemism. Some perissodactyls, such as brontotheres, went extinct although rhinos, tapirs, and horses all survived through the Oligocene.
15 maj 2013 · The fossils, of a stem hominoid and a stem-cercopithecoid, were found in a stratum in the East African Rift of Tanzania precisely dated to 25.2 million years.
