TRACE FOSSILS, records the activity of organisms, including nests and footprints., AMBER-PRESERVED FOSSILS, organisms become trapped in tree resin that hardens into amber after the tree gets buried underground., PRESERVED REMAINS, an entire organism becomes encased in material such as ice or volcanic ash or immersed in bogs., PERMINERALIZATION, minerals carried by water are deposited around a hard structure, NATURAL CASTS, flowing water removes all of the original bone or tissue, leaving just an impression

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