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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 received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Geological Congress
  • 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, following the Cambrian Period, and ended 443 8 million years ago, when the Silurian Period began
  • 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
  • Ordovician Period—485. 4 to 443. 8 MYA - U. S. National Park Service
    The Ordovician System rounded out the threefold division of early Paleozoic rocks (i e , Cambrian, Ordovician, and Silurian), which are all named for Welsh tribes
  • 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
  • Ordovician Period Information and Facts - National Geographic
    During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the second largest
  • Ordovician - New World Encyclopedia
    The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth, in 1879, to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in northern Wales into the Cambrian and Silurian periods, respectively
  • Prehistoric Life During the Ordovician Period - ThoughtCo
    The Ordovician is the second period of the Paleozoic Era (542-250 million years ago), preceded by the Cambrian and succeeded by the Silurian, Devonian, Carboniferous and Permian periods
  • The End-Ordovician Mass Extinction Wiped Out 85 Percent of Life
    Long before the dawn of humans, dinosaurs, insects or even trees, a cascade of unfortunate events threatened to end life on earth During the Ordovician Period, around 485 to 444 million years ago, the diversity of marine life exploded
  • The Ordovician System: Key concepts, events and its distribution across . . .
    Ironically, the Ordovician was one of the longest of the geological periods, characterized by major magmatic and tectonic activity, an immense biodiversification, significant fluctuations in climate and sea levels and the first Phanerozoic mass extinction of marine invertebrates





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