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Lecture 12

GEO 101 Lecture 12: Geology Chapter 11

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Geological Sciences
GEO 101
William Lambert

Geology Chapter 11 Algal Bloom (phytoplankton) crimson tide White Cliffs of Dover England part of North Downs Formation Cretaceous Period Millions of coccoliths per cubic cm Cambrian Explosion about 541 million years ago, there was an explosion in the diversity of living organisms Why Study Earths History? 1. We are curious 2. A better picture of Earths history gives us a better chance of finding natural resources 3. We have learned about hazards to life on Earth 4. We have a better idea of what the future may hold in terms of Earths climate The Hadean Eon 4,5404,000 million years ago Spans Earths formation (4,540 mya) to first preserved crustal rocks (4,000 mya) Little is known about the Hadean Differentiation occurred causing heaving metals (core) to separate from lighter elements (crust) Earliest rocks were likely destroyed by period of intense meteorite impacts (3,900 mya) hell on earth moon formation theory early atmosphere: water, carbon dioxide, methane, ammonia, hydrogen, nitrogen, sulfur dioxide The Archean Eon 4,0002,500 million years ago begins with first appearance of continental crust
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