112lect12 - GY 112 Lecture Notes D. Haywick (2006) 1 GY 112...

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GY 112 Lecture Notes D. Haywick (2006) 1 GY 112 Lecture Notes Significance of Fossils: Paleogeography Interpretations Lecture Goals : A) What is paleogeography? B) How it works (Late Cambrian fantasy example) C) Paleoclimate resolution Textbook reference: Levin 7 th edition (2003), Chapter4; Levin 8 th edition (2006), Chapter 6 A) What is paleogeography? The term paleogeography refers to the geographical and spatial orientation of landmasses and oceans some time in the past. Through paleogeographic reconstruction, you can visualize the orientation of continents and sea ways and you can determine the distribution of paleoenvironments of deposition. Wegener came up with one of the first paleogeographic maps when he conceived Pangaea (see adjacent image). The real issue with paleogeography is not the final product (i.e., the maps), but the information that you need to get there. You must consider time, fossils, environments of deposition, lateral variations and pretty well every other aspect of geology. This is not easy, and if you want accuracy, it takes a lot of dedication, time and patience. B) How it works (Late Cambrian fantasy example) I think that the best way to illustrate paleogeographical reconstructions is to give you an example of how it it done. We’ll choose a specific time, say the Late Cambrian Period, about 514 million years ago The image below is a reconstruction of the paleogeography at that time according to Chris Scotese. Scotese is based in Texas and through various means (e.g., paleomagnetism), he has produced the most widely accepted paleogeographic maps for the Phanerozoic Era. He also produced a flip book showing the drift of the continents over this period of time which is available for purchase from his website. I have one if you want to see what it is like before you buy.
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GY 112 Lecture Notes D. Haywick (2006)
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112lect12 - GY 112 Lecture Notes D. Haywick (2006) 1 GY 112...

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