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12 Cards in this Set
- Front
- Back
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Angular Unconformity
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an unconformity in which older tiled strata are overlain by horizontal younger strata
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Cenozoic
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time of recent life - began 66 million years ago and is still current
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Cross-Cutting
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an ingenous intrusion or fault cuts through other rocks and the intrusion is younger than the rock it cuts
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Faunal Succession
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fossily organisms succeed one another in a definite reversable
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Inclusion
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any piece of rock type contained within another is older than the rock containing it
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Mesozoic
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time of middle life, from 245 million years ago to 66 million years ago
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Original Horizontality
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layers of sediment deposited evenly, with each new layer laid horizontally over the old sediment
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Paleozoic
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time of ancient life 544 million years ago to 245 million years ago
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Precambrian
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time of hidden life - 4.6 billion years ago when the earth formed to 544 million years ago. makes up 85% of earth's history
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Radiometric Dating
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method of calculating hte age of geometric materials based on nuclear decay of naturally occuring radioactive isotopes
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Superposition
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in an undeformed sequence of sedimentary rocks, each layer is older than the one above and younger than the one below
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Unconformity
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break or gap in the geologic record, caused by an interuption in the sequence of deposition or by erosion of pre-exsiting rock
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