Interpreting Geologic History

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The principle of superposition can be used to determine the relative ages of all except

folded sedimentary rocks

If a fault offsets a sequence of sedimentary rocks it must be

younger than the rocks based on the principle of cross-cutting relationships

The principle of inclusions states that

a sedimentary rock must be younger than the clasts that it contains

A nonconformity occurs when

a series of sedimentary rocks sits upon eroded igneous rocks

A disconformity occurs when

there has been some uplift and erosion but no folding between deposition of rocks above and below the disconformity.


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