Periodization in Earth History

Periodization in Earth History

Geological Histories and Timing Geological Time Scale

Law of Superposition In an undisturbed sequence of rocks, strata

that are younger will be deposited on top of strata that are older Law of Original Horizontality

All sedimentary rocks are originally deposited horizontally.

Sedimentary rocks that are no longer horizontal have been tilted from their original position

Walthers Law Rock strata that conformably overlie

one another must have accumulated in adjacent depositional environments Transgression and Regression

Relative Timing Exercise

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