imprint - an impression in soft mud, leaves behind a trace or trail of the plant/animal, mold fossil - a type of fossil that shows the hollow (unfilled) impression of an organism, cast fossil - a mold fossil that has filled in with sediment and turned to rock, trace fossil - a type of fossil that shows activity (movement) of an organism, but not the actual remains of the plant or animal itself, true form fossil - actual plant/animal is in the fossil; all animal features (fur, skin, etc.) are intact; trapped in amber/tar/ice, amber/resin - sap that has hardened; animals can become preserved (saved) in it,

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