Fossil: The remains or traces of ancient life
Fossil record: All of the fossils that scientists have recovered from the ground
Trilobite: ancient extinct marine species, fossils of which are found around the world
Cast: the impression formed in a mold, or the protective plaster covering used to preserve and transport fossils
Geologic Time Scale: A diary of life on earth that hjelps scientists keep track of when a species appeared and
disappeared on Earth.
Excavate: The recovery of preserved, buried remains