Fossil

A fossil was the preserved remnants of an organism from the distant past.

The fossil skull of a Fendahl core, nicknamed Eustace, was discovered by Dr. Fendelman in the 1960s. (TV: Image of the Fendahl)

In 2526, While Adric was calculating the coordinates to guide the TARDIS back into E-Space, the Fifth Doctor was wandering in a cave examining dinosaur fossils. He said he had always wanted to go back and learn what was the cause for their extinction. (TV: Earthshock)

Permians appeared to be animated skeletons of theropod dinosaurs. An archaeological expedition in Alaska in 1964 unearthed a Permian fossil, which revived and attacked them. (AUDIO: The Land of the Dead)

The Pharos Institute discovered a fossilised Silurian egg. Sarah Jane Smith visited them to take a look. (TV: Sarah Jane's Alien Files episode 6)