Epoch, in geology, a subdivision of geologic time. Geologists divide the earth's history into eras, which are subdivided into periods. Each period, in turn, is subdivided into epochs.
Paleontology, the study of fossils, or plant and animal remains from past geologic time.
Hollywood makes T. rex seem fast and agile, but some scientists think it was a scavenger, like a vulture. So which was it?