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First record of the chancelloriid Allonnia from the middle Cambrian Wheeler Formation (Drumian, Miaolingian) of western Utah

Abstract

A newly described specimen of chancelloriid represents the first occurrence of Allonnia in the middle Cambrian Wheeler Formation of Utah. This occurrence fills a geographic gap in the genus’s distribution from the Burgess Shale Formation (British Columbia) to the El Gavilán Formation (Sonora). It is also the geologically youngest occurrence of the genus in North America.

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