Lecture#16 - which they form is the same...

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Lecture#16 10/22/08 Distinguish between relative time age dating and absolute time age dating. Describe uniformatarianism. Describe the following principles of relative time: a) superposition b) original horizontality c) lateral continuity d) cross-cutting relationships Relative Time- older younger, sequence of events Absolute Time- putting a number to the age Uniformatarianism- “the present is the key to the past”, the ways in which rocks form today is the same as when they formed in the past, doesn’t mean the rate at
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Unformatted text preview: which they form is the same Superpostion-youngest layer is on top, oldest layer is on the bottom Original horizontality-sedimentary rocks are deposited horizontally, a shift in the rock causes them to shift vertically Lateral continuity- sedimentary rocks were once connected but due to erosion valleys and canyons formed Crosscutting relationships- intrusions of igneous rock cut across country rock already there C is the oldest, Y is youngest...
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