A mineral signature for finding Burgess Shale-type fossils
Various scientists have suggested that the earliest life on Earth originates from the natural stays of life forms without hard parts. However, by far most of the fossils depend on hard tissue, for example, shells, teeth, and bones for their conservation.
Soft tissue parts, for example, eyes and inside organs, tend to decay before they can fossilize. This additionally is valid for living beings made up totally of soft tissue, for example, worms.
https://www.techexplorist.com/minera...fossils/11893/