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Lecture 12

Lecture 12 - Principles of Geologic Time

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Western University
Earth Sciences
Earth Sciences 1083F/G
Cameron Tsujita

Lecture 12Principles of Geologic Time y Determining Geologic Ages o Relative datingplacing rocks and events in their proper sequence of formation o Numerical absolute datingspecifying the actual number of years that have passed since an event occurred known as absolute age dating y Principles of Relative Dating o Law of Superposition in an unchanged sequence of sedimentary rocks the oldest rocks are on the bottom o Principle of Original Horizontality layers of sediment are generally deposited in a horizontal position rock layers that are flat are undisturbed o Principle of CrossCutting Relationships younger features cut through older features o Inclusions an inclusion is a piece of rock that is enclosed within another rock rock containing the inclusion is younger o Unconformity a break in the geologic record produced by erosion andor nondeposition of rock units represents lost timeTypesy Angular titled rocks overlain by flatlying rocks y Disconformity strata on either side of the
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