MORRIS S. PETERSEN, DIETER KORN, JÜRGEN KULLMANN; THE EARLY MISSISSIPPIAN (OSAGEAN) AMMONOID DZHAPRAKOCERAS (CEPHALOPODA) FROM UTAH. Journal of Paleontology ; 74 (5): 853–857. doi: https://doi.org/10.1666/0022-3360(2000)074<0853:TEMOAD>2.0.CO;2
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The Mississippian ammonoid genus DzhaprakocerasPopov, 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.