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The Oligocene (IPA: / ˈ ɒ l ɪ ɡ ə s iː n,-ɡ oʊ-/ OL-ə-gə-seen, -goh-) [4] is a geologic epoch of the Paleogene Period that extends from about 33.9 million to 23 million years before the present (33.9 ± 0.1 to 23.03 ± 0.05 Ma). As with other older geologic periods, the rock beds that define the epoch are well identified but the ...
A map of Earth 45 million years ago during the Eocene Epoch, Lutetian Age. ... [17] which led to a mass extinction of 30–50% of benthic foraminifera ...
Researchers have identified five other major extinction events in Earth's history, with estimated losses below: [11] End Ordovician: 440 million years ago, 86% of all species lost, including graptolites; Late Devonian: 375 million years ago, 75% of species lost, including most trilobites
By 28.7 million years ago, the Gamburtsev ice cap was now much larger due to the colder climate. [10] CO 2 continued to fall and the climate continued to get colder. [10] At 28.1 million years ago, the Gamburtsev and Transantarctic ice caps merged into a main central ice cap. [10] At this point, ice was now covering a majority of the continent ...
The fossils were between 35.5 to 35.9 million years old and were found in a nearly 10-foot-long rock core: a tube-like sample taken from underneath the Gulf of Mexico by the scientific Deep Sea ...
Researchers have wondered how an alligator-size arthropod lived more than 300 million years ago. The discovery of an intact Arthropleura head offers new insights. ... its many legs to roam Earth ...
Earth may have had a ring made up of a broken asteroid over 400 million years ago, a study finds. ... Nearly two dozen impact craters known to occur during this time were all within 30 degrees of ...
Earth formed in this manner about 4.54 billion years ago (with an uncertainty of 1%) [25] [26] [4] and was largely completed within 10–20 million years. [27] In June 2023, scientists reported evidence that the planet Earth may have formed in just three million years, much faster than the 10−100 million years thought earlier.