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16 Cards in this Set
- Front
- Back
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Body fossil
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The remains of a part of the organism
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Trace fossil
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Evidence of past life that does not include the organism itself (i.e., footprints)
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Index fossil
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A fossil that is particulary useful in dating the strata in whidh it is found. the best index fossils are of organisms that were abundant, wide ranging, identifiable, readily pre-served, and rapidly evolving.
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Phanerozonic Eon
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Latest 1/8 of geologic time; abundant fossil record of organisms w/ hard parts.
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Precambrian Eon
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Earliest 7/8 of getime; relatively simple organisms existed that did not construct hard parts, and whose fossils therefore were rarely pre-served.
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Preservation bias
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Natrual process causing the remains of certain organisms to be more likely preserved than others
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Collector's bias
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Most paleontologist specialize in study of a limited group of organisms.
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Mold
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hollow cavity left in the sediment after the original fossil has dissolved
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Cast
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Mold is later filled with sediment
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Replacement
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Atom by atom replacement of organic matter by minerals
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Premineralization
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Void space in bone or teeth is filled in by minerals
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Compression
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Carbon resides
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Impression
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Imprints
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Superposition
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In an undisturbed sequence, younger srata overlie older strata.
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Cross-cutting relationships
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What cuts is younger than what gets cut
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Faunal succession
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Organisms evolve through time and thus, we expect to see a progression of fossil forms in older to younger rocks
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