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Vocab 2/8

mummification a method of preservation through dehydration; bacteria that cause decay cannot survive arid (dry) environments
freezing a method of preservation through very cold temperature; bacteria that cause decay cannot survive in very cold environments
petrification a method of preservation that occurs when minerals in groundwater replace the organic material in a dead organism
carbon films a type of fossil in which a carbon imprint of a leaf, stem, flower, or fish is left in sedimentary rock made of soft clay or mud
mold an empty space left in a sedimentary rock when a shell or other hard object dissolves
cast a replica of the original organism; created when mud or sand fills a mold
coprolite fossilized dung or waste material
gastrolith fossilized digestive stone from a dinosaur
trace fossil a fossilized mark that formed in sedimentary rock by the movement of an animal on or within soft sediment. Examples include: tracks, footprints, borings, and burrows
index fossil a fossil that is used to establish the age of rock layers because it is distinct, abundant, and widespread and existed for only a short span of geologic time