Paleocene

例句：

1. 1.The paleocene era is characterized by the appearance of new species.
   白垩纪时期以新物种的出现为特征。
2. 2.Paleocenic fossils are often found in sedimentary rocks.
   在沉积岩中常常发现古新世化石。
3. 3. The paleocene dinosaurs were a major part of the ecosystem during this time.
   白垩纪的恐龙是这一时期生态系统的重要组成部分。