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Description
Flashcards by Lindsay McBride, updated more than 1 year ago
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Created by Lindsay McBride
about 7 years ago
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| Question | Answer |
| Fossils | preserved traces or remains of living things |
| What is the first step of fossil formation? | when living things die and are buried by sediments |
| What is the second step of fossil formation? | soft part decays & hard part stays |
| What is the third step of fossil formation? | sediment slowly hardens into rock & preserves shape of organism |
| What kind of rock are fossils found in? Why? | Sedimentary because 1) the layers pile up 2) it wouldn't be in igneous/metamorphic rock because that requires heat or pressure |
| Petrified fossils/perimineralized fossils | spaces inside organism are filled w/ minerals from groundwater |
| Mold fossil | formed when hard part decays and leaves a hollow cavity in shape of organism |
| Cast fossil | formed when minerals or sediment fill in space in shape of organism |
| Carbonaceous film fossil | thin layer of carbon on the rock; left when gases/liquids given off by body form an image |
| trace fossils | provides evidence of activity (animal size, speed, behavior) |
| original remains | actual remains of organism |
| Original remains occur if trapped in ______, ________, or ______. | amber, ice, or tar |
| index fossil | organisms that existed for a short period of time, lots of fossils from that time period |
| Some examples of index fossils with behavior are ..... | Herd protecting the young Predator stalking and attacking |
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