Tommotian and Burgess Shale formations give clues about Precambrian evolution.

早间，Tommotian和伯吉斯页岩化石群为前寒进化提供了线索。

Precambrian animals must therefore have lived at such depths.

因此，前寒动物肯定曾经生活在这么深地方。

These findings are not of Precambrian animals themselves, but of their tracks.

发并不是寒前动物本身，而是它们足迹。

But red in tooth and claw the Precambrian was not—for neither teeth nor claws existed.

但是前寒时期却不是腥牙血爪，因为那个时候牙齿和爪子都没有出。

The schoolboy turned it in to a paleontologist at the University of Leicester, who identified it at once as Precambrian.

那位小生把化石交给了莱斯特大一位古生物家。他马上认出那是寒之前东西。

On this scale, according to John McPhee in Basin and Range, the distance from the fingertips of one hand to the wrist of the other is Precambrian.

按照这个比例，据约翰·麦克菲在《海洋和山脉》一书中说，一只手指尖到另一只手手腕之间距离代表寒以前年代。