Cope, E.D. (1875). Report on the geology of that part of New Mexico surveyed during the field-season of 1874. In: Wheeler, G.M. (Ed.) Annual Report upon the geographical explorations and surveys west of the one hundredth meridian, in California, Nevada, Nebraska, Utah, Arizona, Colorado, New Mexico, Wyoming, and Montana: Being Appendix LL of the Annual Report of the Chief of Engineers for 1875. Government Printing Office, Washington, DC, pp. 61-97