JEG100H1 Chapter 11: Plate tectonics
27 Oct 2016
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Fragmented 200 million ears go during early mesozoic. In reality, fit depends on edge of continental shelves, not coastlines. Fossils in black shale of permian period in south america and southwest africa. Seeds too large to be carried by wind. Rocks on one continent should match age and type of rocks on another continent. 2. 2 billion year old igneous rocks in brazil resembling rocks in africa. Mountain belts terminate at coastline and mountains of similar age and structure continue across ocean. Tree fern fossils consistent with warm, moist climates. Wegener suggest gravitational force from moon, like tidal forces. But forces that strong would stop earth"s rotation. No evidence that ocean floor permits passage without deformation of continent in process. No oceanic crust older than 180 million years. North american, south american, pacific, african, eurasian, australian-indian, antarctic. Other plates: caribbean, nazca, philippines, arabian, cocos, scotia, juan de fuca. First established by plotting earthquake and volcano locations.
