February 7th - February 7th Tectonics 1: Evidence A)...

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February 7 th Tectonics 1: Evidence A) Matching coastlines B) Similarities of particular features between continents C) Linear mountain belts D) Paleomagnetism Matching Coastlines - As soon as first crude maps were available, Sir Francis Bacon (1561-1626) noted that South  America and Africa fit together. * Coastlines are irrelevant, we only consider the crust. - Based on a variety of evidence, Alfred Wegener, a German meteorologist, suggested that  continents break up and drift   continental drift. * Wegener’s idea: - Trailing edge: Tension - Leading edge: Compression Similarities of particular features between continents - Evidence for 300 Ma glaciation (rare in Earth’s history) on multiple continents, but flow  indicators point shoreward! - Rock units that connect one continent to another, now separated by oceans. - Vegetation/climate zones (recorded by rocks of specific ages) match up across continents now  separated by oceans. - Fossils of land dwelling animals and plants are present of continents now far separated by  oceans. - Geophysicists: * A ‘continent’ is a mass of rock, but it is too weak to be pushed or pulled.
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This note was uploaded on 04/30/2008 for the course GEOL 120 taught by Professor Maglouihlin during the Spring '08 term at Colorado State.

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February 7th - February 7th Tectonics 1: Evidence A)...

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