Geologic Time and Earth History. Two Conceptions of Earth History: Catastrophism Assumption: Great Effects Require Great Causes Earth History Dominated.

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Presentation transcript:

Geologic Time and Earth History

Two Conceptions of Earth History: Catastrophism Assumption: Great Effects Require Great Causes Earth History Dominated by Violent Events Uniformitarianism Assumption: We Can Use Cause And Effect to Determine Causes of Past Events Finding: Earth History Dominated by Small-scale Events Typical of the Present. Catastrophes Do Happen But Are Uncommon

Two Kinds of Ages Relative - Know Order of Events But Not Dates Civil War Happened Before W.W.II Bedrock in Wisconsin Formed Before The Glaciers Came Absolute - Know Dates Civil War World War II Glaciers Left Wisconsin About 11,000 Years Ago

Law of Superposition Youngest rock layers are on top.

Law of Superposition Superposition - Young Events Leave Traces Behind of Older Rocks Young Rocks Laid Down on Older Rocks Intrusions Are Younger Than The Rocks They Intrude Folds And Faults Are Younger Than The Rocks They Occur in

Rock layers in the grand canyon can be dated and matched with other regions.

The Geologic Time Scale