	Authors	Year	Title
	Gordon	1964	California Carboniferous Cephalopods. Geological Survey Professional Paper 483-A: A1-A27, 12 figs., pl.1-4, Washington.
	Nikolaeva, Kulagina & Pazukhin	2009	Paleontology and Microfacies of the Serpukhovian in the Verkhnyaya Kardailovka Section, South Urals, Russia: potential candidate for the GSSP for the Viséan-Serpukhovian boundary.(S.V.Nikolaeva, et al., for full authors see Note. Newsletters on Stratigrahy, 43/2: 165-193, 8 fig.,3 pl., Berlin, Stuttgart.
	Titus	2000	Late Mississippian (Arnsbergian Stage-E2 chronozone) ammonoid paleontology and biostratigraphy of the Antler foreland basin, California, Nevada, Utah. Bulletin 131 Utah Geological Survey, 1-108, 51 text-figs., 17 tabls., 16 pls., Salt Lake City.