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Oligocene    音标拼音: ['ɑləgos,in]
n. 渐新世,渐新统
a. 渐新世的,渐新统的

渐新世,渐新统渐新世的,渐新统的

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  • Oligocene - Wikipedia
    The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch The Oligocene is the third and final epoch of the Paleogene Period 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 [10]
  • Oligocene Epoch | Climate, Flora Fauna | Britannica
    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
  • The Oligocene Epoch - University of California Museum of Paleontology
    The late Oligocene Deseadan record includes two major groups that are thought to represent early waif dispersals from other continents One of these, the caviomorph rodents (e g , porcupines, capybaras, chinchillas, and a wide assortment of smaller forms), was the only group of rodents in South America until the Plio-Pleistocene
  • Oligocene Epoch (34 – 23 million years ago) – Global cooling . . .
    The Oligocene Epoch, spanning from approximately 34 to 23 million years ago, represents a significant chapter in Earth's geological history It is
  • Oligocene - New World Encyclopedia
    The Oligocene epoch is a division of the geologic time scale and the third and final epoch of the Paleogene period It extends from about 34 million to 23 million years before the present The Oligocene follows the Eocene epoch and is followed by the Miocene epoch The start of the Oligocene is marked by a extinction event that may be related to the impact of large extraterrestrial object in
  • Oligocene - an overview | ScienceDirect Topics
    The Oligocene is defined as a geological epoch spanning from approximately 34 to 23 million years ago, characterized by two recognized stages: the Early Oligocene (Rupelian) and the Late Oligocene (Chattian) It is marked by significant climatic events, including the expansion of Antarctic glaciers, and is situated between the Eocene and Miocene epochs AI generated definition based on
  • Oligocene | Perissodactyl - American Museum of Natural History
    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
  • Oligocene Epoch | Encyclopedia. com
    Oligocene The Oligocene epoch (39 to 22 million years ago) is the transition period between the earlier and later Tertiary period (65 to 2 million years ago) A key feature of evolution is the ripple effect created by geographical changes that influence climate and therefore vegetation and ultimately the ways in which animals develop The most important geographical event separating the
  • Overview of the Oligocene Epoch - ThoughtCo
    The Oligocene epoch marked the continuing transition between the wildlife of the Eocene and Miocene epochs Here's a look at prehistoric life during the Oligocene epoch
  • Oligocene Epoch - Geology Page
    The Oligocene is a geologic epoch of the Paleogene period and extends from about 33 9 million to 23 million years before the present (33 9±0 1 to 23 0





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