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Devonian    音标拼音: [dɪv'oniən]
n. Devonshire的,泥盆纪

Devonshire的,泥盆纪

Devonian
n 1: from 405 million to 345 million years ago; preponderance of
fishes and appearance of amphibians and ammonites [synonym:
{Devonian}, {Devonian period}, {Age of Fishes}]


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  • Devonian - Wikipedia
    The Devonian ( dəˈvoʊni ən, dɛ - də-VOH-nee-ən, deh-) [9][10] is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60 7 million years from the end of the preceding Silurian period at 419 62 million years ago (Ma), to the beginning of the succeeding Carboniferous period at 358 86 Ma It is the fourth period of both the Paleozoic and the Phanerozoic
  • Devonian Period | Definition, Climate, Animals, Plants, Timeline, Map . . .
    Devonian Period, in geologic time, an interval of the Paleozoic Era that follows the Silurian Period and precedes the Carboniferous Period, spanning between about 419 2 million and 358 9 million years ago It is sometimes called the ‘Age of Fishes’ because of the diverse and abundant fishes found in Devonian seas
  • Devonian Period | Natural History Museum
    The Devonian Period ended with one of the five great mass extinctions of the Phanerozoic Era However, unlike the four other great extinction events, the Devonian extinction appears to have been a prolonged crisis composed of multiple events over the last 20 million years of the Period
  • Devonian Period: Life, Fossils, Climate, and Major Events
    Devonian Period: Life, Fossils, Climate, and Major Events Learn about the Devonian Period, including when it happened, how it was named, the Age of Fishes, giant reef systems, Devonian trilobites, the first forests, the origin of tetrapods, major extinction events, famous fossil sites, and places where collectors can find Devonian fossils
  • Portal:Devonian - Wikipedia
    The Devonian ( dəˈvoʊni ən, dɛ - də-VOH-nee-ən, deh-) is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60 7 million years from the end of the preceding Silurian period at 419 62 million years ago (Ma), to the beginning of the succeeding Carboniferous period at 358 86 Ma It is the fourth period of both the Paleozoic and the Phanerozoic It is
  • Devonian Period—419. 2 to 358. 9 MYA - U. S. National Park Service
    Devonian age fossil brachiopod, Death Valley National Park, California and Nevada NPS image Introduction Before their Cambrian Silurian naming controversy, Adam Sedgwick and Roderick Impey Murchison jointly named the Devonian System for the rocks of Devonshire in southern England, having done the actual work prior to their misunderstanding Actually Devonshire is a poor type area because the
  • Devonian Period - Fossils, Marine Life, Plants | Britannica
    Devonian Period - Fossils, Marine Life, Plants: A highly varied invertebrate fauna that originated in the preceding Silurian Period continued in the Devonian, and most ecological niches of shallow and deep marine water were exploited The remarkable proliferation of primitive fishes, which has given the period the name the “Age of Fishes,” occurred in both fresh and marine waters
  • Devonian - an overview | ScienceDirect Topics
    The Devonian is defined as a geological period of the Palaeozoic Era characterized by significant diversification of vertebrate life, the evolution of the first terrestrial vertebrates (amphibians), the development of large reef ecosystems, and the emergence of the Earth's first forests, while also witnessing one of the major mass extinctions in Earth's history It is divided into seven Ages
  • Devonian Period and Prehistoric Information | National Geographic
    The Devonian ancestors of fishes living today belonged to two main nonarmored groups The cartilaginous fish, so-called because cartilage formed their skeletons, later gave rise to sharks and rays
  • The Devonian Period
    Online exhibits : Geologic time scale : Paleozoic Era The Devonian Period The Rhynie Chert in Scotland is a Devonian age deposit containing fossils of both zosterophylls and trimerophytes, some of the earliest vascular plants This indicates that prior to the start of the Devonian, the first major radiations of plants had already happened The oldest known vascular plants in the Northern





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