During the Mississippian rocks of the Chainman Shale were deposited in the Antler Foreland Basin. Fossil cephalopods are very common in these rocks in west-central Utah and eastern Nevada. Asbian age members of the Chainman Shale include the Skunk Spring Limestone Bed and the lowest beds of the Camp Canyon Member. The fossil cephalopods shown below are from these rocks in the Confusion Range of Millard and Juab Counties.

References: Gordon, Mackenzie, Jr., 1971, Goniatites americanus n.sp., A Late Meramec (Mississippian) Index Fossil, U.S.G.S. Professional Paper 750-C; Kullman, J., Korn, D., and Petersen, M. S., 2000, GONIAT Database System, version 2.90, Tubingen
 

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Goniatites americanus Zone

Goniatites americanus Gordon 1971



Girtyoceras sp.

  
Kazakhoceras sp.

   
Dimorphoceras sp.

Entogonites sp.

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Goniatites multiliratus Zone

Concretion containing Goniatites multiliratus Gordon 1965  and an orthocone

Girtyoceras meslerianum (Girty) 1909

  

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Top Left: Goniatites multiliratus Gordon 1965, Right: Girtyoceras meslerianum (Girty) 1909
Center: Entogonites
Bottom Left & Center: Goniatites americanus Gordon 1971, Bottom Right: Girtyoceras n. sp.
all are Goniatitid ammonoids
 

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