名詞 paleocene:

1. from 63 million to 58 million years ago; appearance of birds and earliest mammals
   同義詞：Paleocene epoch

Pa.le.o.cene

adj.（形容詞）
Of, belonging to, or designating the geologic time, rock series, and sedimentary deposits of the first epoch of the Tertiary Period, preceding the Eocene Epoch and characterized by the appearance of placental mammals.See table at geologic time
古新代的：屬于或是地質(zhì)時代、巖系的段和沉積礦床第三紀的第一時代的，早于始新世時代并且以胎生哺乳動物的出現(xiàn)為特征參見 geologic time
n.（名詞）
The Paleocene Epoch.
古新代
The deposits of the Paleocene Epoch.
古新代礦床