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Gondwana |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.03 sec. |
Gondwanaor GondwanalandHypothetical former supercontinent in the Southern Hemisphere, which included modern South America, Africa, southern Europe, India, Australia, and much of the Middle East and Antarctica. The concept that the continents were at one time joined was first set forth in detail by Alfred Wegener in 1912. He envisioned a single great landmass, Pangea, which supposedly began to separate early in the Jurassic Period (approximately 200 million to 146 million years ago). Subsequent workers distinguished between a southern landmass, Gondwana, and Laurasia to the north. See also continental drift. Gondwana [gänd′wä·nə] (geology) The ancient continent that is supposed to have fragmented and drifted apart during the Triassic to form eventually the present continents. Also known as Gondwanaland. 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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Part three describes the time when amphibians and reptiles in North America, the Elgin region, and Gondwana began to resemble modern-day creatures. New Caledonia is a fragment of the ancient continent of Gondwana and subsequently separated from Australia and New Zealand. Enriched mantle sources are more common in a globe-encircling band possibly related to the detachment of African and South American subcontinental lithosphere during the assembly and breakup of Gondwana. |
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