Lecture 26_Chapter36 [F2008)

Lecture 26_Chapter36 [F2008) - Plan Lecture26:Chapter36...

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1 Lecture 26: Chapter 36 A Brief History of Earth Plan How old is Earth ± Eras and periods Home Work: Chapter 36 Key Terms Review questions: 2, 7, 8, 9, 11, 12, 18, 21 How old is Earth? Uniformitarianism is a geological doctrine that states that the natural laws (like laws of physics) have been constant over geological past past. The scientific theories and tools we have today can be used to learning about the past. The Earth’s history is recorded in rocks! Relative Dating Sedimentary rock layers and lava flows provide good evidence of relative rock ages Five principles to determine the relative ages of rocks 1. Original horizontality: each new layer is laid down nearly horizontally over older sediments 2. Superposition: in an undeformed sequence of sedimentary rocks, each layer is older than the one above and older than the one below. 3. Cross cutting: an igneous intrusion or fault that cuts through preexisting rock is younger . 4. Inclusion: Any inclusion is older than the rock containing it. 5. Faunal succession: Fossil organisms follow one another in a definite, irreversible time sequence .
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2 Unconformities The most rock layers were deposited without
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This note was uploaded on 05/27/2011 for the course PSC 1121 taught by Professor Khankasayev during the Fall '08 term at Florida A&M.

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Lecture 26_Chapter36 [F2008) - Plan Lecture26:Chapter36...

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