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Chapter 13 (1) - Chapter 13 Methods for Studying the Past...

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Chapter 13 Methods for Studying the Past Identifying ancient orogens: by looking for a belt of curst, we can determine the ages of rocks formed during orogeny by using radiometric dating. Recognizing the growth of continents: Geologists find the ages of different regions of the crust by using modern radiometric dating techniques. The identities of the rock types making up the crust indicate the tectonic environment in which the crust is formed Recognizing past depositional environments: Studying successions of sedimentary rocks, for the environment controls both the type of sediment deposited at a location and the type of organisms that live there Recognizing past changes in relative sea level: Determining whether sea level has gone up or down by looking for changes in the depositional environment. Recognizing positions of continents in the past: Study of paleomagentism can tell us the latitude of a continent in the past. Second we can study marine magnetic
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