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  2. Oligocene - Wikipedia

    en.wikipedia.org/wiki/Oligocene

    The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. [9] Major changes during the Oligocene included a global expansion of grasslands, and a regression of tropical broad leaf forests to the equatorial belt.

  3. Paraceratherium - Wikipedia

    en.wikipedia.org/wiki/Paraceratherium

    Other genera of Oligocene indricotheres, such as Baluchitherium, Indricotherium, and Pristinotherium, have been named, but no complete specimens exist, making comparison and classification difficult. Most modern scientists consider these genera to be junior synonyms of Paraceratherium , and it is thought to contain the following species; P ...

  4. Eocene–Oligocene extinction event - Wikipedia

    en.wikipedia.org/wiki/Eocene–Oligocene...

    The Eocene–Oligocene extinction event, also called the Eocene-Oligocene transition (EOT) or Grande Coupure (French for "great cut"), is the transition between the end of the Eocene and the beginning of the Oligocene, an extinction event and faunal turnover occurring between 33.9 and 33.4 million years ago. [1]

  5. Fayum (fossil deposit) - Wikipedia

    en.wikipedia.org/wiki/Fayum_(fossil_deposit)

    The transition from the Eocene to the Oligocene is found in Chron 13, which occupies the lower part of the Gebel-Qatrani Formation. Accordingly, by far the largest part of the rock unit is of Oligocene origin, only the lowest 48 m was already formed in the Upper Eocene.

  6. Geological history of Earth - Wikipedia

    en.wikipedia.org/wiki/Geological_history_of_Earth

    A brief marine incursion marks the early Oligocene in Europe. There appears to have been a land bridge in the early Oligocene between North America and Europe since the faunas of the two regions are very similar. During the Oligocene, South America was finally detached from Antarctica and drifted north toward North America.

  7. Eocene - Wikipedia

    en.wikipedia.org/wiki/Eocene

    The end of the Eocene and beginning of the Oligocene is marked with the massive expansion of area of the Antarctic ice sheet that was a major step into the icehouse climate. [106] Multiple proxies, such as oxygen isotopes and alkenones , indicate that at the Eocene–Oligocene transition, the atmospheric carbon dioxide concentration had ...

  8. Rupelian - Wikipedia

    en.wikipedia.org/wiki/Rupelian

    The base of the Rupelian Stage (which is also the base of the Oligocene Series) is at the extinction of the foraminiferan genus Hantkenina. An official GSSP for the base of the Rupelian has been assigned in 1992 (Massignano, Italy). The transition with the Chattian has also been marked with a GSSP in August 2017 (Monte Conero, Italy). [5]

  9. Ohanapecosh Formation - Wikipedia

    en.wikipedia.org/wiki/Ohanapecosh_Formation

    The volcanic clastic Ohanapecosh Formation is an early state of cascade volcanism. It has been dated to the middle Oligocene [36 to 28 Ma]. [1] The strata are as much as 3 kilometres (1.9 miles) thick, with exposures visible in more than 400 square kilometres (99,000 acres) of a total area exceeding 700 square kilometres (170,000 acres).