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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
  • 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
  • Ordovician Period—485. 4 to 443. 8 MYA - U. S. National Park Service
    Rocks from the Ordovician Period contain evidence that plants began colonizing dry land at this time Most experts agree that the ancestors of land plants first evolved in a marine environment, then moved into a freshwater environment and finally onto land
  • The Ordovician Period - University of California Museum of Paleontology
    The Ordovician is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates) A typical marine community consisted of these animals, plus red and green algae, primitive fish, cephalopods, corals, crinoids, and gastropods
  • 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 Recognizing that the fossil fauna in the disputed
  • 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 Period: Facts, Information, and Timeline - A-Z Animals
    The Ordovician Period is the second period of the Paleozoic Era (the first and longest era of the Phanerozoic eon) The era began about 541 million years ago with the Cambrian explosion, which saw the rise and diversity of many of earth’s organisms
  • 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
  • Ordovician period - Geology Page
    The Ordovician ɔrdəˈvɪʃən is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485 4 ± 1 9 to 443 4 ± 1 5 million years ago (ICS, 2004) It follows the Cambrian Period and is followed by the Silurian Period
  • Ordovician Period - Natural History Museum
    The Ordovician ended with the second greatest extinction event of the Phanerozoic Eon Two massive reductions, a million years apart, created this event—resulting in the extinction of more than 60% of invertebrates





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