The fossils of these organisms are found on lands that are now far apart. He found research on identical fossils on the coasts of Africa and South America, something for which geologists, convinced that the world map was immutable, had offered a more implausible explanation: land bridges that had vanished after permitting animals and plants to travel from one continent to another. He just sat smoking his pipe and listening. When these plates press together and . Plate Tectonics and Our National Parks (2020), Text and Illustrations by Robert J. Lillie, Emeritus Professor of Geosciences, Oregon State University [E-mail]. They are not sites of volcanism, and their seismic activity is restricted to the area between offset ridge crests, where earthquakes indicating horizontal slip are common. In the early 1960s, dating of ocean-core samples showed that the ocean floor was younger at the Mid-Atlantic Ridge but progressively older in either direction, confirming the reality of seafloor spreading. shock absorbers, The idea of continental drift circulated in scientific circles until World War II, when sounding gear produced new evidence of what the seafloor looked like. He argued against the claim that earlier land bridges between the continents had sunk. Six years later he led another expedition to Greenland, this time with government backing, where he would set up yearlong weather-monitoring equipment at three stations on the glacier. Fossils of similar organisms across widely disparate continents encouraged the revolutionary theory of continental drift. Your comment will be published after validation. Blocks of thick continental crust fit together nicely along the edges of their shelves to form the supercontinent called Pangea. to have murmured, "Nevertheless, it moves!". The idea of continental drift was not accepted easily by the scientific establishment. In prechristian era, Greek philosophers discussed about fossils, later Leonardo da Vinci studied fossils in great detail so that he is today regarded as Father of Palaeontology. Evidence supporting the hypothesis The strikingly similar Paleozoic sedimentary sequences on all southern continents and also in India are an example of evidence that supports continental drift. For instance, the North American plate is much larger than the North American continent; the plate extends from the western coast of North America to the mid-Atlantic. Alfred Wegener and His Theory of Continental Drift | OpenMind Wegeners theory was not taken seriously until about the 1960s, when scientists believed they had finally worked out a mechanism (plate tectonics) for the movement of the continental plates. Ironically, the final vindication of Wegeners hypothesis came from the field of geophysics, the subject used by Jeffreys to discredit the original concept.

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