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Fossils and Geo Hist
Term | Definition |
---|---|
fossil | remains of animal or plant in a rock |
index fossil | fossil that is used for dating which it was found |
permineralized remains | process in fossilization where casts of organisms |
molds and casts | organisms buried dissolve away |
original remains | evidence of in rock that something is in presence of that time |
trace fossils | fossil of a footprint or any trace of animals |
relative age | determination of age of past events |
superposition | concept of behaving and nature |
horizontality | layers of sediment and deposited through gravity |
absolute age | true age of a fossil |
half-life | time required for any specific property |
isotopes | 2 or more forms of the same element |
radioactive decay | transformation of atomic nucleus |
geologic time | time from which things form |
eon | very long period of time |
era | time range that something takes place |
period | time whenm something takes place |
epoch | period of time in history or persons life |
pangaea | super continent that contains land masses |
trilobite | extinct animal the occurred during the Paleozoic era |
precambrian | depositing system of rocks |
mesozoic era | development of birds,flying reptiles,flowing plants, and extinction of dinosaurs. |
cenozoic eara | more recent,formation of modern continents,diverse mammals and plants |