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the perserved trace, imprint, or remains of a plant or animal - almost always found in sedimentary rocks
the soft parts of plants and animals decay - the hard parts are replaced by minerals
Mold and Cast
an impression that an organism leaves behind after decaying and then is filled in - the mold shows the original shape of the fossil (mold is the hole)
any indirect evidence of life preserved as an impression in rock; trails, footprints, tracks, burrows, and bite marks
when sediment piles up increasing pressure and heat on a buried organism a thin film of detailed carbon residue is left behind
fossils from species that existed on Earth for
(1) short periods of time, (2) Rwere abundant, and were (3) widespread geographically
found in Coastal Plain, Valley and Ridge, and Appalachian Plateau - most made of marine organisms
Highest mountains in VA. Mount Rogers highest peak. Made up of igneous and metamorphic rock, oldest rocks in VA (245 - mya)
Valley and Ridge
an area of long parallel ridges separated by valleys - made up of sedimentary rocks,
(350-570 mya), fossils include sea critters
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