Authors	Year	Title
Gordon	1957	Mississippian Cephalopods of Northern and Eastern Alaska. Professional Papers, U.S. Geological Survey, 283: 1-61, fig.1-61, pl.1-6; Washington.
Miller & Furnish	1958a	Middle Pennsylvanian Schistoceratidae (Ammonoidea). Journal of Paleontology, 32 (2): 253-268, fig.1-9, pl.33-34; Tulsa,Oklahoma.
Titus & Riley	1997	Recognition and correlation of eustatic flooding events in the late Visean of Utah (SW USA) and Britain (NW Europe). Newsletter on Carboniferous Stratigraphy 15: 19-22, 1 text-fig.