fossils chapter 21.4
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Fossils Chapter 21.4. fossil : remains or evidence of living things. (1) original remains : the actual, unchanged remains of the organism are preserved. (a) frozen in ice. (b) preserved in amber(tree sap that has hardened. (c) mummification. - PowerPoint PPT PresentationTRANSCRIPT
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FossilsChapter 21.4
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fossil: remains or evidence of living things
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(1) original remains: the actual, unchanged remains of the organism are preserved
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(a) frozen in ice
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(b) preserved in amber(tree sap that has hardened
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(c) mummification
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(2) replaced remains: soft parts of the organism have disappeared and been replaced by minerals
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petrification
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(3) molds and casts of the original organism(4) trace fossils: evidence of life other than remains of an organisms activities and/or appearance
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(a) footprints
(b) imprint
(c) tracks, trails, burrows, borings
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coprolites: fossilized dung or waste materials from ancient animals
T-Rex Carnivore Coprolite (8 lbs.)
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gastroliths: fossilized stone found within the digestive system of a dinosaur or other reptile
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index fossil: fossils found exclusively in rock record of a particular geologic age•must have (4) characteristics:(1) must be easily recognizable(2) must be widespread in occurrence(3) must be limited in time(4) must be found in large numbers with the rock layer