Chadian (Osagean, Mississippian) Ammonoids
in Chadian age rocks of the Delle
Phosphatic Member of the
Limestone. Those shown below are from these
rocks in the Stansbury Range of eastern Tooele County. I would
thank Dr. Morris Petersen for showing me this locality and precisely
to find the ammonoid bearing concretions.
References: Petersen, M. S., Korn, D., and Kullman, J., 2000, The Early Mississippian (Osagean) Ammonoid Dzhaprakoceras (Cephalopoda)
From Utah, Journal
of Paleontology Vol. 74, no. 5, p. 853-857; Kullman,
D., and Petersen, M. S., 2000, GONIAT
Database System, version 2.90, Tubingen
Petersen, Korn and Kullmann 2000
a specimen from a concretion, 52mm dia.
a flattened impression from the phosphatic shale, at the same level as
about 70mm dia.
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