2011. Girtyoceras hamiltonense; Korn & Titus, p. 150, text-figs. 30, 31

Holotype. UMNH IP 3127, figured by Korn & Titus, 2011, text-fig. 30B.

Type locality. Hamilton Canyon, bed 44; Camp Canyon Member of Chainman Formation, Goniatites

eganensis Biozone