The Burgess shale and Chengjiang Biota are famous for their preservation of soft-bodied animals (alternatively,nonmineralized or nonskeletonized).

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The Burgess shale and Chengjiang Biota are indeed famous for their exceptional preservation of soft-bodied animals, including many extinct species that are not found in other types of rocks. The preservation is mainly due to the rapid burial of the organisms in fine-grained sediment which prevented decay and allowed for the formation of detailed impressions or even three-dimensional structures.

The Burgess Shale and Chengjiang Biota Are Famous for Their