Geol 101 Geological Time and Rock Record

Geol 101 Geological Time and Rock Record - Geol 101...

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Geol 101 Geological Time and the Rock Record 14/09/2007 10:52:00 Rock Record Position in layerd sequence implies relative age Used to reconstruct Earth’s History Study of strata (layers) – stratigraphy Rules Principle of Superposition o When rocks were placed, new place on top Law of Original Horizontality o Sediment layers are horizontal when they form Principle of Cross-Cut Relationships o Geologic features that cut across frock must be younger than what they  cut through Principle of Inclusions o Object enclosed in rock must be older than the rock Two Assumptions Constant sedimentation rate during accumulation All strata exhibit conformity, meaning they have been deposited layer after  layer without interruption Considerations  Sediment rates vary widely Uncomformities Angular contract between 2 layers that are inclined at different angles
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This note was uploaded on 04/28/2008 for the course GEOL 101 taught by Professor Olinsky during the Fall '08 term at Texas A&M.

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Geol 101 Geological Time and Rock Record - Geol 101...

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