Corral reef diversity issue

I have wondered about this corral reef diversity issue for quite awhile, and have come to the conclusion that there may be more going on here than meets the eye. On a recent trip to the Burgess Shale in the Canadian Rockies I was amazed to learn that the only reason the mid-Cambrian fossils were preserved was that they currently lie in the “stress pressure shadow” of a massive carbonate reef. I have also recently seen Ediacarin fossils in Australia in place in the Flinders Ranges that are much more poorly represented in sandstones and thus more poorly represented in the geological record — no corral reefs at that time. I think preservation may have tinged the value of this study more than may be realized.

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