. Collected reprints, Essa Institute for Oceanography. Oceanography India's present position is ascribed to its having impinged against the underbelly of Asia on its journey north, forcing up the Himalaya Mountains in the process. those usually promoted by drifters. The Mesozoic Break-Up My tentative speculation as to how the continents dispersed would begin with the breakup and dispersal of the two supercontinents Laurasia and Gondwana commencing late in the Jurassic Period, in the middle of the age of dinosaurs, about 150 million years ago. Most likely this was a unique event i
. Collected reprints, Essa Institute for Oceanography. Oceanography India's present position is ascribed to its having impinged against the underbelly of Asia on its journey north, forcing up the Himalaya Mountains in the process. those usually promoted by drifters. The Mesozoic Break-Up My tentative speculation as to how the continents dispersed would begin with the breakup and dispersal of the two supercontinents Laurasia and Gondwana commencing late in the Jurassic Period, in the middle of the age of dinosaurs, about 150 million years ago. Most likely this was a unique event in earth history. Certainly the continents have not been repeatedly fragmented through geologic time. There clearly had been a long period of geologic calm before this abrupt dispersal. In the northern hemisphere, North America swung away from Eur- asia, rotating on a hinge point in south- eastern Alaska. Previously Canada had been tied to Europe, and the eastern United States faced an Atlantic Ocean differently configured than now. The southern continents were prob- ably clustered together to form Gond- wana and centered in the mid-Indian Ocean. An X-shaped rift opened up which dispersed India, South America- Africa, Antarctica, and Australia to the four directions of the compass. Sometime later, South America split off from Africa and moved still farther westward. The main stage of this scat- tering of crustal pieces was largely 76. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute for Oceanography; Atlantic Oceanographic Laboratories (U. S. ); Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories. Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by the Supt.
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