Plate Tectonics - Alfred Wegener o Most people thought the...

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Alfred Wegener o Most people thought the complementary shapes were coincidence. o Alfred Wegener proposed the hypothesis of Continental Drift o Published The Origin of Continents and Oceans Continental Drift o Wegener suggested there had once been a supercontinent called Pangaea that began breaking apart 200 million years ago o His hypothesis stated that the continents drift slowly across the Earth’s surface Evidence o Fit of South America and Africa o Patterns of: Glaciations (climate) --- ice ages Leave marks on the landscape Evidence of glaciation about 250 million years ago – an unusual patter for today but not a rearranged set of continents Rock types and structures Matching Mountain ranges o Rock types and mountain belts can be matched on either side of the Atlantic Fossils Mesosaurus, other animals and plants Summary of the evidence o Coastlines match o Similar rock types and ages o Ancient glaciation of same age o Similar fossils Continental crust drifts through oceans?
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Plate Tectonics - Alfred Wegener o Most people thought the...

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