太阳活动的衰减是否会以某种方式引起小冰川期，这还不清楚。

Whether the decreased solar activity was somehow responsible for the little ice age is still unknown.

它们在盘古大陆上分布广泛，死亡后形成煤炭，导致了长达一亿年的冰川期。

These spread across the supercontinent of Pangaea and died, creating coal, leading to a 100-million-year Ice Age.

我们尚不清楚我们是否生活在一个后冰川期(postglacial)还是在间冰期.

We do not know whether we live in a postglacial period or an interglacial period.