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.
