Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
RICHARDS SPUR UNIDENTIFIED PARAREPTILE? References
Chronological
P.P. Vaughn (1958) " On a new pelycosaur from the lower permian of Oklahoma, and on the origin of the family Caseidae" Journal of Paleontology, 32: 981 - 991
R.C. Fox (1962) " Two new pelycosaurs from the lower permian of Oklahoma " University of Kansas Publication of the Museum of Natural History, 12: 297 - 307
M. Laurin, R.R. Reisz (1988) "Taxonomic position and phylogenetic relationships of Colobomycter Pholeter, a small reptile from the lower permian of Oklahoma" Canadian Journal of Earth Sciences 26: 544 - 550
S.P. Modesto (1999) "Colobomycter Pholeter from the lower permian of Oklahoma: a parareptile, not a protorothyridid" Journal of Vertebrate Paleontology 19(3): 466 - 472
