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Aya alygeo chapter 2 - Geology 100 Professor Ohan Chapter 2...

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Geology 100 Professor Ohan Chapter 2 1) In the early 1900s Alfred Wegener set forth the continental drift hypothesis. 2) One of its major tenets was that a supercontinent called Pangaea began breaking apart into smaller continents about 200 million years ago. The smaller continental fragments hen “drifted” to their present positions. 3) Pangaea (plate tectonics) a hypothetical continent including all the landmass of the earth prior to the Triassic period when it split into Laurasia and Gondwanaland 4) To support the claim that the now separate continents were once joined, Wegener and other used the fit of South America and Africa, fossil evidence, rock type and structures, and ancient climates. 5) One of the main objections to the continental drift hypothesis was its inability to provide an acceptable mechanism for the movement of continents. 6) In the 20 th century the prevailing view of how land animals migrated across vast expanses of ocean is by rafting, isthmian links, island stepping stones or either continental drift.
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