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supercontinent |
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supercontinent a great landmass thought to have existed in the geological past and to have split into smaller landmasses, which drifted and formed the present continents supercontinent [′sü·pər‚känt·ən·ənt] (geology) A large continental mass, such as Pangea, that existed early in geologic time and from which smaller continents formed and separated by fragmentation and drifting. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In 1912, Alfred Wegener, the father of the theory of continental drift, presented extensive evidence showing that some two hundred million years ago the world's continents were all joined into a single supercontinent, which he called Pangaea. Dromaeosaurids' presence on all of those continents suggests that the group's common ancestor lived on the Gondwana supercontinent when it was still intact, at least 145 million years ago. A complete record of mafic magmatism provides critical constraints, not only on such questions as the nature of flood volcanism or the supercontinent cycle through time, but also on geochemical fluxes, geodynamics, core and mantle evolution, global climate evolution, major extinction events, major impact events, the evolution of sedimentary basins, and strategic mineral resources. |
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