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21 Cards in this Set
- Front
- Back
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Alfred Wegener |
German meteorologist and polar explorer, wrote "The Origins of the Continents and Oceans in 1915" |
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"The Origins of the Continents and Oceans" |
hypothesized Pangaea, suggested that land moves slow (continental drift) |
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Continental drift evidence |
fit of continents, glacial deposits, paleoclimatic belts, distribution of fossils, matching geologic units |
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glacial evidence |
late paleozoic glaciers found on five continents |
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fossil evidence |
identical fossils found on separated land |
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lystrosaurus |
nonswimming, land reptile
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cynognathus |
nonswimming, land mammal-like reptile |
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Proterozoic Eon |
lots of assembly and rifting, 90% of continental crust formed |
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Cratons |
cold, stable, interior regions of continental crust |
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parts of craton |
shield, platform, basement |
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supercontinents |
formed by continental collisions |
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Effects of rifting |
new ocean basins, siberian cration, laurentia, gondwana |
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Laurentia |
North america, greenland |
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gondwana |
sound america, africa, india, Australia |
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taconic orgogeny |
created pre appalachians |
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middle paleozoic |
silurian greenhouse |
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silurian greenhouse |
climate warmed, flooding, vast reefs, new marine species, acadian orogeny uplifts early appalachian mts |
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late paleozoic |
sea level regression, epicontinental sea becomes swamps, pangea formation |
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dynamo thermal metamorphism (regional metamorphism) |
tectonic collisions deform huge mobile belts |
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rocks in mt building |
heated via geothermal gradient and plutonic intrusions, squeezed and heated by deep burial, smashed and deformed by compression and shearing |
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exhumation |
returns rocks to surface by uplift, collapse, and erosion |
