Lucas, S. G., Krainer, K., Chaney, Dan S., DiMichele, William A., Voigt, S., Berman, D. S., and Henrici, A. C. 2012. "The Lower Permian Abo Formation in the Fra Cristobal and Caballo Mountains, Sierra County, New Mexico." In Geology of the Warm Springs Region: New Mexico Geological Society 63rd Annual Field Conference Guidebook. Lucas, S. G., McLemore, V. T., Lueth, V. W., Spielmann, J. A., and Krainer, K., editors. 345–376. Socorro, New Mexico: New Mexico Geological Society.
