112 Lab (Paleo Maps)

112 Lab (Paleo Maps) - Caty Gordon Geology 112 Section 01...

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Caty Gordon Geology 112 Section 01 Paleogeographic Reconstructions and Climate Change Lab 1. What information concerning a continent’s former location is provided by remnant magnetization which is preserved in a rock? What are the limitations of this method? When the earth’s magnetic field reverses polarity, the age of the magnetic anomalies can be determined by using radiometric dating and fossil evidence and thus can aide in determining the past positions of continents during the last 150 millions superimposing linear magnetic anomalies of the same age. 2. When geologists use magnetic sea floor data to relocate continents, what is the maximum age of reconstruction that is possible? Why isn’t older seafloor magnetic data available? The maximum age of reconstruction that is possible is approximately 150 million years. Older seafloor magnetic data is not available because they are determined through fossil evidence, which is scarce in the time frame preceding 150 my. 3. Evidence about past climate conditions may be inferred from certain rock types. What are some examples of rock types that form under very specific climate conditions? Some examples of rock types that form under very specific conditions are coal, bauxite, and tillites. Coal forms under wet conditions, bauxites need warm and wet conditions, and tillites where it is wet and cool. 4.
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112 Lab (Paleo Maps) - Caty Gordon Geology 112 Section 01...

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