fossil vocab
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| preserved remains or traces of animals, plants, or other organisms | fossil
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| formed in by layers by the deposition of weathered rocks. sediments are pressed and cemented together | sedimentary rocks
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| geologists assume newest rock layers on are top of the older ones unless disturbance occurs | law of supposition
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| petrification, replacement, permineralization, molds and casts, carbonization, fossil resin (amber),tar and ice, and trace fossils | types of fossilization
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| both result in organic material converting into stone or a similar substance | petrification
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| replacement and permineralization are what type of? | petrification
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| happens when water dissolves the original solid material and replaces them with mineral matter such as calcite, silica, pyrite and hematite this happens slowly | replacement
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| groundwater carries dissolved minerals into the pores and cavities of bone, wood, or shells, original matter is preserved then replaced, bones , teeth, and shells are preserved. | permineralization
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| organism dies and and there is no filling of the cavity with minerals | molds
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| organism dies and the cavity fills with minerals, sand or clay | casts
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| process by which all substances of plants and animals decay, except carbon, leaves a carbon film on the sedimentary rock, usally occurs in a fish | carbonization
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| sticky resin captures insects and other invertebrates, hardens ,preserved in the resin including their dna,known has amber | fossil resin
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| excreted from certain plants, which is thought to protect them from insects and seals off plant injuries | resin
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| an animal can become trapped in tar and the whole body can be preserved, freezing can trap whole mammals | tar/ice
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| footprints ,tracks, burrows, feces, and borings | trace fossils
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| special fossils, easily recognized, abundant, wide spread, lived a short period of time | index fossils
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| most accurate form of dating | absolute age
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| rock like structures built by blue-green algae, first forms of life on earth - oldest known fossils | stromatolites
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| using relative and absolute dating scientists are able to put together the Earth’s geologic history | fossil record
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| fossils can tell us something about the environment at the time the organism died. | environment
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Created by:
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