Document Type
Article
Author ORCID Identifier
Frederick A. Sundberg https://orcid.org/0000-0002-9178-8176
Journal/Book Title/Conference
Journal of Paleontology
Publisher
Cambridge University Press
Publication Date
1-10-2024
Journal Article Version
Version of Record
First Page
1
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Last Page
30
Abstract
The trilobite faunas that occur with the Steptoean Positive Isotope Carbon Excursion (SPICE) at Smithfield Canyon, Utah, have been reported, but not illustrated. Given the importance of the SPICE at this section for international correlations, the trilobites from new collections from the upper Nounan Dolomite to lower St. Charles Formation at Smithfield Canyon are reported herein and integrated with the previously reported taxa. Trilobite assemblages indicate that the upper Cedaria to the Ellipsocephaloides biozones (Miaolingian Series, Guzhangian Stage to Furongian Series, Jiangshanian Stage) are present stratigraphically below or above the SPICE.
Some of the taxa reported herein may represent new species, but they are not represented by well-enough preserved specimens and are left in open nomenclature. However, Kingstonia smithfieldensis n. sp. and Bromella utahensis n. sp. are named on the basis of common and well-preserved specimens.
New carbon isotope data from Smithfield Canyon from an overlapping section of the lower St. Charles Formation, that add to the overall shape of the SPICE curve, are presented. The new δ13C values above the Elvinia Biozone range from –0.36‰ to +1.5‰, confirming that the SPICE concludes within the Elvinia Biozone.
Recommended Citation
Sundberg, Frederick A.; Cothren, Hannah R.; Dehler, Carol M. (2024). Cambrian Trilobites from the Nounan Dolomite and Lower St. Charles Formation (Upper Marjuman to Lower Sunwaptan; Miaolingian to Furongian Series), Smithfield Canyon, Northern Utah. Journal of Paleontology. 1–30. DOI: https://doi.org/10.1017/jpa.2023.48
