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。
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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。
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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.