trace - fossils that show evidence of an animal's activity, mold - A cavity in the ground where an animal or plant was buried, cast - Sediment fills a mold, amber - hardened tree sap, yellow to brown in color, often a source of insect fossils, petrification - An organism’s tissue is replaced by minerals, extinct - no longer in existence , fossilization - a rare event where remains or evidence of organisms are hardened or preserved, paleontologist - a scientist who studies the form of life that existed in former geological periods, mainly by studying fossils, fossil - any evidence of the preserved remains, or traces of remains, of ancient organisms , coprolite - preserved feces (poop), index fossil - Evidence of an organism that lived a short, well-defined timespan, mummification - an organism dries out, frozen fossil - an organism is frozen in ice, fossil in tar - An organism is preserved in a tar pit, burrow - shelters left by animals as they dig underground, track - evidence of an animal’s activity such as footprints,

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