fossil - the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soilfucoid - a fossilized cast or impression of algae of the order Fucales belemnite - a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae ammonite, ammonoid - one of the coiled chambered fossil shells of extinct mollusks guide fossil, index fossil - a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found microfossil - a fossil that must be studied microscopically remains - any object that is left unused or still extant; "I threw out the remains of my dinner" |