Plate Techtonics - 1) Plate Techtonics 2) Continental Drift...

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1) Plate Techtonics 2) Continental Drift a) Alfred Wegener i) Father of plate techtonics (1) German metiorologist (a) introduces hypothesis in origin of continents and oceans 1915 (b) sugested that a continent called pangea existed b) Wegeners evidence i) Fossils (1) mesosauraus (a) snaggle toothed reptile (b) (c) lived in fresh water (2) Glossopteris (a) seed fern associated with polar climates (b) found in australia, africa, india,and S amer in the late Pz seds ii) Paleoclimate Evidence (1) polar conditions in LPz (2) tropical conditions (a) major coal fields in iii) Geologic Structures (1) Mtn belts match across oceans as well as rock types (2) major crticism (a) no mechanism for movement of continents 3) The major breakthroughs a) paleomagnetics i) magnetism (1) a force that is produced by electric current (2) its a field that surrounds moving electrons (3) The earth generates a very weak magnetic field (a) flow of M south to M north (b) the earths mag poles are different than geologic poles (4)
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Plate Techtonics - 1) Plate Techtonics 2) Continental Drift...

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