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