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Journal of Paleontology

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THE EARLY MISSISSIPPIAN (OSAGEAN) AMMONOID DZHAPRAKOCERAS (CEPHALOPODA) FROM UTAH

¹ Department of Geology, Brigham Young University, Provo, Utah 84602,
² Institut für Geologie and Paläontologie, Universität Tübingen, Sigwartstr. 10, D-72076, Tübingen, Germany

The Mississippian ammonoid genus Dzhaprakoceras Popov, 1965, well known in the eastern hemisphere, is reported from the Delle Member of the Deseret Limestone at Flux and Lakeside Mountains, Tooele County, Utah. This is the first report of the genus in western North America. The ammonoids, D. gordoni n. sp. and D. djaprakense (Librovitch, 1927) occur with mehli—Lower texanus Zone conodonts indicating a middle Osagean (earliest Viséan) age.