Answer: paleogene

AnswerCrossword Clue
paleogenebelonging to a certain geological time period also PALEOCENE
paleogenethe Paleogene Period or System
paleogenenoting or pertaining to the earlier part of the Cenozoic Era, in the system adopted by some geologists, occurring from 65 to 25 million years ago and including the Oligocene, Eocene, and Paleocene epochs: corresponds to the earlier part of the Tertiary Pe