单词 | pangaea |
释义 | PangaeaPangean. (The name of) a vast continental area or supercontinent, comprising all of the continental crust of the earth, which is thought to have existed during the Permian and Triassic periods (and earlier, perhaps from the Proterozoic era, in some theories) before breaking up into Gondwana and Laurasia. Cf. Panthalassa n. ΘΚΠ the world > the earth > land > land mass > continent > [noun] > specific Lemuria1864 Gondwanaland1896 subcontinent1896 Fennoscandia1907 subcontinent1907 Pangaea1924 Laurasia1931 Euramerica1972 Gondwana- 1924 J. G. A. Skerl tr. A. Wegener Orig. Continents & Oceans xiii. 192 Thus the Pangæa of the Carboniferous era had already an anterior margin (America), which became folded (Precordilleras)..; and a posterior margin (Asia). 1928 C. Schuchert in Theory Continental Drift (Amer. Assoc. Petroleum Geol.) 106 The rifting of Pangaea and the floating away of Australasia, Antarctica, and the Americas are said to have begun east of Africa in Jurassic time and west of Euro-Africa in early Cretaceous time. 1942 J. H. F. Umbgrove Pulse of Earth vii. 138 The fusion of the continental blocks into a single, large primordial continent, which is known as Pangaea [1947 Pangea], would provide an adequate explanation..of the present widely-scattered remnants of the upper paleozoic glaciations. 1977 Sci. Amer. Mar. 92/3 About 600 million or perhaps one billion years ago the ancestors of all the present continents were evidently combined into one immense supercontinent, named Pangaea, which may have come into existence as much as 2.7 billion years ago. 1994 Nature 20 Jan. 233/1 South China was an isolated tectonic block during the latest Permian... It may have served as a refugium for groups already declining on Pangea. 2003 M. Redfern Earth: Very Short Introd. v. 85 Going further back in time, it seems that Pangaea itself was made up from an accumulation of earlier continents. This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022). < n.1924 |
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