GEOL 101 Lecture Notes - Lecture 2: Deep Sea, Oceanic Crust, Paleomagnetism

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18 Jan 2017
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In 1915, alfred wegner set forth a new hypothesis called continental drift. Wegner postulated the formation of a supercontinent called pangea. Similar fossils are found on continents separated by vast oceans. Example: mosasaurs an aquatic reptile found only in black shales of permian age. Mountain belts should be similar in age & type to those found in the adjacent continents. Appalachian mountain belt should match rocks found in the mountain of africa, Ancient ice sheets once covered parts of south america, southern africa, india, and. Continents in the n. hemisphere = near the equator. Continents in the s. hemisphere = near the south pole. Wegner presented his hypothesis, but he could not explain how or why continents drifted. New scientific development propelled the theory of plate tectonics forward. Scientists discovered that as the iron-rich, liquid outer core circulates around the iron-rich inner core, it generates a magnetic field. Iron-rich minerals can become aligned with the earth"s magnetic field.

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