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6 Cards in this Set
- Front
- Back
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Where do you find fossils |
sedimentary rocks -anoxic -quiet water energy of environment helps determine the quality of fossil Fossils occasionally found in low grade metamorphic rocks |
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ways to make a fossil 1. original material |
amber mummiication in caves |
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Replacement of original material |
Permineralisation-most vertabrate and invefrtebrate fossils Original material dissolves or decaays and is replaced with another material May be entirely new material or recrystalisation of original material examples include calcite silica aragonite pyrite |
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Distilation (carbonisation) |
More volitile chemicals burned off leaving a carbon imprint of original material behind Common fossils include plants grapolites some soft bodied organisms rarely found with large animals |
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trace fossils |
body impressions -mould =hole in rock after body destroyed -cast=hole filled in with new material where fossil used to be burrows, tracks trails -only fossils soft bodied organisms may leave behind feeding traces escape structures footprints poo-coprolites |
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fossils tell us |
that the animal existed where it live what the environment was like when it lived'' If the environment changed over time how it behaved (trace fossils, footproints, burrows etc) |
