Smith, J. P. (1927). Upper Triassic marine invertebrate faunas of North America. <em>United States Geological Survey Professional Paper.</em> 141: 1-262, pls. 1-121.[details] Available for editors
original descriptionSmith, J. P. (1927). Upper Triassic marine invertebrate faunas of North America. <em>United States Geological Survey Professional Paper.</em> 141: 1-262, pls. 1-121.[details] Available for editors