The Ediacara fossil formation, which contains the oldest known animal fossils, consists exclusively of soft-bodied forms.

包含已知最古老的动物化石的埃迪卡拉化石组，只含有软体动物。

youdao

A slightly younger fossil formation containing animal remains is the Tommotian formation, named after a locale in Russia.

一个较新的包含动物遗骸的化石地层是托莫特地层，它以俄罗斯的一个地区命名。

youdao

Even if they are lucky enough to have a complete fossil, they may be unable to say much about how the animal behaved if it looks unlike anything they have seen before.

即使他们十分幸运的弄到一个完整的化石，如果它和以前他们所有见过的东西都不像，他们也没法对这个动物的行为了解更多。

youdao

Natural gas is considered the cleanest of the fossil fuels, the fuels created by plant and animal remains over millions of years.

VOA: special.2009.10.23

Nature heavily skews the odds against an animal becoming a fossil most simply decompose.

NEWYORKER: Bones of Contention

Like a fossil hinting at a long-gone animal, a black hole is offering clues about a now-destroyed galaxy that may once have existed around it.

MSN: Rare Black Hole Survives Galaxy's Destruction