- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
A critical summary of the conclusions of a number of recent papers on Permian and Triassic tetrapods, mainly Reptilia. These papers are by J. A. Efremov on Russian forms, A. S. Romer and L. W. Price on Pelecosauria, mostly American, G. G. Simpson on Multituberculata, C. C. Young on Chinese forms, and T. E. White on Seymouria. A correlation table of vertebrate horizons in Texas, Russia, and South Africa is included.