from or referring to the period of time between about 66 and 56 million years ago

He identified and mapped marine Palaeocene sediments in the Casterton region. 他发现并绘制了卡斯特顿地区的海洋古新世沉积物的分布图。

The crocodile will be part of a new Palaeocene Era display. 这条鳄鱼将成为新的古新世时期展览的一部分。

the Palaeocene period (= the period of time between about 66 and 56 million years ago)

The fossils come from the Palaeocene. 这些化石来自于古新世。

There were two volcanic events in the Palaeocene. 古新世时期发生过两次火山活动。