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9 Cards in this Set
- Front
- Back
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what is the law of superposition
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in layers of undisturbed sedimentary rok, the oldest layer is at the bottom and the youngest layer is on top
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what is the law of original horizontality?
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sediments that are deposited in water are under the influence of gravity and are deposited in horizontal layers.
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what is the law of cross cutting?
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igneous intrusions, faults, and folds, are younger that the rock around them.
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what is the law of inclusions?
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fossils, sediments, and fragments contained within a rock are older than the rock surrounding it.
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what is the law of unconformities?
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exceptions to the "laws" that represent times of erosion in groups of rock (strata). A break in the rock record.
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what is disconformity?
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an erosional surface between horicontal sedimentary layers.
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what is angular unconformity?
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erosion between tilted sedimentary rock and horicontal layers of sedimentary rock.
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what is nonconformity?
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erosion between igneous or metamorphic rock and sedimentary rock layers.
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what do scientists use to divide the history of Earth into time units?
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eonds, eras, periods, and epochs
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