Brigantian age rocks in the Chainman Shale include the Camp Canyon Member. The fossil cephalopods shown below are from these rocks in the Confusion Range of Millard County.
References: Miller, A. K., Youngquist, W., and Nielson, M. L., 1952, Mississippian Cephalopods from Western Utah, Journal of Paleontology Vol. 26, no. 2; Kullman, J., Korn, D., and Petersen, M. S., 2000, GONIAT Database System, version 2.90, Tubingen. Titus, A. L., Korn, D., Harrell, J. E., & Lambert, L. L. (2015). Late viséan (late mississippian) ammonoids from the barnett shale, sierra diablo escarpment, Culberson county, Texas, USA. Fossil Record, 18(2), 81-104
See Camp Canyon or Bishop Springs
Top Row: Pachylyroceras utahensis
(Miller, Youngquist and Nielsen) 1952
The large one is 49mm dia.
Middle Left and Lower Center: Sulcogirtyoceras
ornatissimum (Miller and Youngquist) 1948
Upper Center: Choctawites choctawensis
(Shumard) 1863
Middle Right: Lusitanoceras granosum
(Portlock) 1843
Bottom Left and Center: Lusitantites
subcircularis (Miller) 1889
Bottom Right: Mitorthoceras perfilosum
Gordon 1960
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