Analyzing the Rock Layers and Fossil Records

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Analyzing the Rock Layers and Fossil Records

Unit 1 Module 1 Lesson1

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Principle of Uniformitarianism Relative Age Dating Absolute Age Dating Relative Age Principle Superposition Original Horizontality Lateral Continuity Inclusions Crosscutting Relationships

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How can the Rock layers and geologic Features in this photo be used sequence past geologic events?

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To define the Age

She is older than her sister

She is 16

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Relative Dating Youngest Oldest Absolute Dating 120+5 million years 140+10 million years

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Superposition

ROCK LAYERS •Law of Superposition* younger rocks are on top, older rocks are on bottom Youngest Oldest

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Cross cutting

Crosscutting Relationships Fault Igneous intrusion

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Inclusions

Law of Inclusions • Rock fragments (in another rock) must be older than the rock containing the fragments. sedimentary x x x x x x x igneous x x x x

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Original horizontality

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Original Horizontality

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Lateral Continuity

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Floor of sedimentary basin Stratum terminates by thinning at margin of sedimentary basin Stratum terminates by grading into different kind of sediment

Lateral Continuity

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Fossil Record

*cond Oldest Youngést Layer €0 Oldest Vay9r.