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9 Cards in this Set
- Front
- Back
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Difference between relative age and numerical age
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relative age - the age of one feature with respect to another
numerical age - the age of a feature given in years |
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The principle of Uniformitarianism
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physical process observed today also operated in the past at a similar rate
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principle of superposition
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older strata is found below younger strata
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principle of horizontality and continuity
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sediments accumulate in horizontal , continuous sheets
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principle of cross-cutting relations
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younger features cut through older features
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principle of baked contacts
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hot intrusion bakes the surrounding rock, baked rock must be older -- younger rocks can bake older rocks
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stratigraphic column
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A diagram of a sequence of strata summarizing information about the sequence
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How ages can be correlated regionally
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geologists relate formations between nearby regions based on similarities in rock type
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How ages can be correlated between regions globally
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You look at fossils to define the relative ages --- method fossil correlatoin
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