Pa·le·o·cene (pālē-ə-sēn)
adj.
Of or belonging to the geologic time, rock series, or sedimentary deposits of the first epoch of the Tertiary Period, marked by the appearance of placental mammals and continental collisions leading to the formation of the Rocky Mountains and the Himalayas. See table at geologic time.
n.
The Paleocene Epoch or its system of deposits.

[TahlilGaran] American Dictionary ▲