Cambrian Explosion: an other area of Cambrian fossils (Introduction)

by David Turell @, Thursday, July 18, 2019, 05:24 (352 days ago) @ David Turell

In Utah, and an older level than others:

https://jgs.lyellcollection.org/content/176/4/609.abstract

"Abstract
The Spence Shale Member of the Langston Formation is a Cambrian (Miaolingian: Wuliuan) Lagerst├Ątte in northeastern Utah and southeastern Idaho. It is older than the more well-known Wheeler and Marjum Lagerst├Ątten from western Utah, and the Burgess Shale from Canada. The Spence Shale shares several species with these younger deposits, yet it also contains a remarkable number of unique species. Because of its relatively broad geographical distribution, and the variety of palaeoenvironments and taphonomy, the fossil composition and likelihood of recovering weakly skeletonized (or soft-bodied) taxa varies across localities. The Spence Shale is widely acknowledged not only for its soft-bodied taxa, but also for its abundant trilobites and hyoliths. Recent discoveries from the Spence Shale include problematic taxa and provide insights about the nature of palaeoenvironmental and taphonomic variation between different localities."

Comment: Nothing new. They find some new forms and have no explanation as to why the Cambrian is so different from what preceded except more oxygen appeared. No help for poor Darwin who recognized the danger of the Cambrian gap to his theory


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