Did I mention that things without bones or hard shells don't leave many fossils?
Interesting that you should mention this. Here's what Dr. Chien had to say on that subject:
"When an opportunity came up to talk with Chinese paleontologists and to visit them and the original site of fossil discovery, it became something I had to do. So last March I organized an international group to make a visit there.
"In some ways there are similarities between the China site and the other famous site, the Burgess Shale fauna in Canada. But it turns out that the China site is much older, and the preservation of the specimens is much, much finer. Even nerves, internal organs and other details can be seen that are not present in fossils in any other place.
(Interviewer): And I suppose many of these are probably soft-tissue marine-type animals?
Chien: "Yes, including jellyfish-like organisms. They can even see water ducts in the jellyfish. They are all marine. That part of western China was under a shallow sea at the time."