Geological Histories and Timing. Geological Time Scale.

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Presentation transcript:

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 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 All sedimentary rocks are originally deposited horizontally. Sedimentary rocks that are no longer horizontal have been tilted from their original position

Walther’s Law Rock strata that conformably overlie one another must have accumulated in adjacent depositional environments Rock strata that conformably overlie one another must have accumulated in adjacent depositional environments

Transgression and Regression

Relative Timing Exercise