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| the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock. |
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| in rocks, in amber, when frozen, in asphalt, and in petrification |
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| the filling or replacement of an organism's tissues with minerals that have different chemical compositions than the origional tissues did |
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| a fossilized structure, such as a footprint or a coprolite that formed in sedimentary rock by animal activity on or within soft sediment |
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| the impression left in sediment or in rock where a plant or animal was buried |
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| the history of life in the geologic past as indicated by the traces or the remains of living things. |
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| What are ways scientists organize fossils and how? |
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| They sort fossils by age. They use absolute dating methods (radiometric dating) or Relative dating methods(superposition) |
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| organisms that lived during a relatively short, well-defined geologic time span. Used to date rock layers in which the fossilos are found |
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| living relatives: horseshoe crabs, spiders, scorpions. Lived 400 milllion years ago |
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| Marine mollusks similar to the modern squid. lived 230 million to 208 million years ago in ancient oceans |
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