White, C.A., 1879, Paleontological Papers No. 11: Remarks upon certain Carboniferous fossils from Colorado, Arizona, Idaho, Utah, and Wyoming, and certain Cretaceous corals from Colorado, together with descriptions of new forms: U.S. Geological and Geographical Survey of the Territories, Bulletin, v. 5, no. 2, Art. 16, p. 209-221.