Lecture 2 - Lecture #2: How did the Earth form?...

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Lecture #2: How did the Earth form? Precambrian- Lasted from roughly 5 billion to 540 million years ago. Organisms were sparse and simple. Hadean, Archean, Proterozoic. Phanerozoic- Began at 540 million years ago and continues to today. Begins the evolution of abundant, multi-celled organisms with complex life histories. Paleozoic, Mesozoic, Cenozoic. Hadean- 4.6 to 3.8 billion years ago. First stage. “Hell on Earth”. Interpreted as a period of heavy bombardment from meteors. Magma oceans. Moon created by Mars sized planet hitting the Earth. Silicon and iron rich. Archean- 3.8 to 2.5 billion years. Second stage. Represents the earliest forms of current know life. Evidence of life on Earth. Proterozoic- Banded Iron Formation (BIF). Red color is rust, formation of rust, iron in the presence of oxygen. Paleozoic- 540-250 million years ago. Cambrian explosion of life. Supercontinent of Pangaea existed. Warm and wet. Organisms lived in swampy areas. Trees are called
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This note was uploaded on 03/05/2012 for the course GEOL 460:100 taught by Professor Lepre during the Spring '12 term at Rutgers.

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Lecture 2 - Lecture #2: How did the Earth form?...

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