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Time, Strata and Sequence

Time, Strata and Sequence - Time Strata and Sequence...

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Time, Strata and Sequence Learning to Read the Sedimentary Rock Record Determining geological ages Relative age dates – placing rocks and events in their proper sequence of formation Numerical dates – specifying the actual number of years that have passed since an event occurred (known as absolute age dating )
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Principles of relative dating Law of superposition Developed by Nicolaus Steno in 1669 In an undeformed sequence of sedi- mentary rocks (or layered igneous rocks), the oldest rocks are on the bottom Superposition is well illustrated by the strata in the Grand Canyon Superposition, Original Horizontality and Lateral Continuity
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Principles of relative dating Principle of original horizontality Layers of sediment are generally deposited in a horizontal position Rock layers that are flat have not been disturbed Principle of cross-cutting relationships Younger features cut across older feature Cross-cutting relationships Principles of relative dating Inclusions An inclusion is a piece of rock that is enclosed within another rock Rock containing the inclusion is younger Unconformity An
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