Amber , permafrost and tar preserve soft tissues in fossils.
A fossil is understood as any preserved remain, impression, or trace of any once-living thing from a past geological age. Fossils include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood, oil, coal, and DNA remnants. The totality of fossils is known as the fossil record.
