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silurian    
a. 希留利亚人的

希留利亚人的

Silurian
n 1: from 425 million to 405 million years ago; first air-
breathing animals [synonym: {Silurian}, {Silurian period}]


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  • Silurian - Wikipedia
    The Silurian is the third and shortest period of the Paleozoic Era, and the third of twelve periods of the Phanerozoic Eon As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by a few million years
  • Silurian Period | Definition, Timeline, Map, Events, Fossils, Animals . . .
    Silurian Period, in geologic time, the third period of the Paleozoic Era It began 443 8 million years ago and ended 419 2 million years ago, extending from the close of the Ordovician Period to the beginning of the Devonian Period
  • Silurian Period—443. 8 to 419. 2 MYA - U. S. National Park Service
    Possibly the most remarkable biological event during the Silurian was the evolution and diversification of fish Not only does this time period mark the wide and rapid spread of jawless fish, but also the appearances of both the first known freshwater fish and the first fish with jaws
  • Silurian Period - Natural History Museum
    The Silurian is the first period with fossils of extensive non-microscopic life on land Land fauna included spider-like and millipede-like predators, in addition to herbivorous (live plant) and or detritus feeders
  • Silurian Period Information and Facts - National Geographic
    The Paleozoic era's Silurian period saw animals and plants finally emerge on land But first there was a period of biological regrouping following the disastrous climax to the Ordovician
  • Silurian Period Facts: Climate, Animals Plants - Live Science
    A warm, stable climate provided for one of the most significant developments to take place during the Silurian Period: the arrival of the first plants to colonize the land
  • Silurian - New World Encyclopedia
    The Silurian period is an interval of about 28 million years defined on the geologic timescale as spanning roughly from 444 to 416 million years ago (mya) and lying between the earlier Ordovician period and the later Devonian period
  • 31 Facts About Silurian
    Here are some fun and lesser-known facts about the Silurian Period that highlight its unique characteristics The Silurian Period saw the first appearance of true coral reefs Some Silurian eurypterids could grow up to 2 5 meters long, making them among the largest arthropods ever
  • Silurian hypothesis - Wikipedia
    The Silurian hypothesis is a thought experiment, [1] which assesses modern science's ability to detect evidence of a prior advanced civilization, perhaps several million years ago The most probable clues for such a civilization could be carbon, radioactive elements or temperature variation
  • Silurian Period - Encyclopedia. com
    In geologic time, the Silurian Period, the third period of the Paleozoic Era, covers the time from roughly 440 million years ago (mya) until 410 mya The name, Silurian, derives from the Silures, an ancient British tribe The Silurian Period spans two epochs The Early Silurian Epoch is the most ancient, followed by the Late Silurian Epoch





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