The Pennsylvanian System in the Sacramento Mountains, New Mexico, USA Stratigraphy, Petrography, Depositional Systems, Paleontology, Biostratigraphy, and Geologic History von Lucas, Spencer G., DiMichele, William A., Krainer, Karl 1956-, Barrick, James E., Vachard, Daniel, Donovan, Michael P., Looy, Cindy, Kerp, Hans 1954-, Chaney, Dan S.