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Ordovician    
n. 奥陶纪,奥陶系
a. 奥陶纪的

奥陶纪,奥陶系奥陶纪的

Ordovician
n 1: from 500 million to 425 million years ago; conodonts and
ostracods and algae and seaweeds [synonym: {Ordovician},
{Ordovician period}]


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  • Ordovician - Wikipedia
    The Ordovician ( ɔːrdəˈvɪʃi ən, - doʊ -, - ˈvɪʃən or-də-VISH-ee-ən, -⁠doh-, -⁠VISH-ən) [9] is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon The Ordovician spans 43 75 million years from the end of the Cambrian Period 486 85 Ma (million years ago) to the start of the Silurian Period
  • Ordovician Period | Major Events, Extinction, Facts | Britannica
    Ordovician Period, in geologic time, the second period of the Paleozoic Era It began 485 4 million years ago and ended 443 8 million years ago The interval was a time of intense diversification (an increase in the number of species) of marine animal life in what became known as the Ordovician radiation
  • The Ordovician Period
    The Ordovician Period lasted almost 45 million years, beginning 488 3 million years ago and ending 443 7 million years ago * During this period, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern supercontinent Gondwana Throughout the Ordovician, Gondwana shifted towards the South Pole and much of it was submerged underwater
  • Ordovician Period—485. 4 to 443. 8 MYA (U. S. National Park Service)
    Ordovician age fossil brachiopods, Mississippi National River and Recreation Area, Minnesota NPS image Introduction The naming of the Ordovician Period is tangled with the Cambrian Period Suffice it to say that a Welsh tribe—Ordovices—inspired the name of this geologic period The Ordovician System rounded out the threefold division of early Paleozoic rocks (i e , Cambrian, Ordovician
  • Ordovician Period | Natural History Museum
    The Ordovician* lasted about 45 million years and saw the transition from very primitive to relatively modern life-forms in the seas The “Ordovician radiation” which followed the late Cambrian extinctions, lead to a tripling of marine diversity, the greatest increase in the history of life, and giving the highest levels of diversity seen during the Paleozoic Era
  • Ordovician - New World Encyclopedia
    The Ordovician period is an interval of about 44 million years defined on the geologic timescale as spanning roughly from 488 to 444 million years ago (mya) and being noteworthy for both beginning and ending with extinction events, while also being a source of abundant fossils and in some regions major reservoirs of oil and gas It is the second of six periods of the Paleozoic era, lying
  • Ordovician Period Information and Facts | National Geographic
    Learn about Earth's Ordovician period, which ended in the greatest Mass Extinction of all time
  • Ordovician meteor event - Wikipedia
    Ordovician meteor event Paleogeography of Earth around the time of Ordovician meteor event (465 Ma) The Ordovician meteor event was a dramatic increase in the rate at which L chondrite meteorites fell to Earth during the Middle Ordovician period, about 467 5 ± 0 28 million years ago, [1][2] lasting for about 40 million years [3]
  • Ordovician Period - Marine Life, Climate Change, Extinction | Britannica
    Ordovician Period - Marine Life, Climate Change, Extinction: Numerical climate models as well as carbon isotope measurements from preserved Ordovician soils suggest that atmospheric levels of carbon dioxide during the period were 14–16 times higher than today These high levels were driven by widespread volcanic activity, which would have released large volumes of carbon dioxide into the
  • The Ordovician - University of California Museum of Paleontology
    The Ordovician period began approximately 490 million years ago, with the end of the Cambrian, and ended around 443 million years ago, with the beginning of the Silurian At this time, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern super-continent Gondwana





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