13<) J. ir. Bcede — Correlation of the Gxiadalupiaii 



stone beneath the gypsum beds northwest of Koswell. He 

 states that "P^ossils are not abundant in the formation, but in 

 one locaUt}^ northwest of Koswell a number were collected, 

 which consisted mainly of Schisodus and Pleuropkorus^ pre- 

 served as casts. According to Dr. Gii'ty, the fauna and 

 lithology of these specimens suggested the latest Carboniferous 

 beds or Permian of the Mississipjn valley in Texas." * 



This correlation is in accord with the stratigraphie relation- 

 ship of the beds, though (xirty, in a later paper, discredits the 

 evidence of Pleurophorus. 



So far as I am aware this is the only record of fossils admit- 

 ting of reasonable determination being found in the Permian 

 red beds of the Pecos valley. At the locality south of Lake- 

 wood, previously described, in the limestone capping the 

 gypsum escarpment at a horizon probably 300 feet or moi'C 

 above the horizon of Fisher's specimens, fossils of some five or 

 six species were found. They consist of Gyrtodontarca f 

 paralleUidentata ? + C.?.sp., another pelecypod, the cast of an 

 ostracod, and some minute gastropods from one to three milli- 

 meters in length badly preserved as molds. The Vyrto- 

 dontarccn appear, though jioorly preserved, to be specifically 

 identical with one of the species from the Whitehorse and 

 Quartermaster beds of Oklahoma and the Panhandle of Texas. 

 Like them, these shells are by far the most abundant fossils in 

 the collection. 



At the locality west of Carlsbad, already described, in what 

 seems to be the top of the Guadalupian limestone, specimens 

 of Naticella transversa, formerly known only from the Quar- 

 termaster beds, and a Pleurophorus common to both the 

 Whitehorse and Quartermaster foj-mations, together with a few 

 other poorly preserved specimens, were found. This occur- 

 rence indicates an earlier appearance of some of the Quarter- 

 master forms in New Mexico than farther northeast. 



These faunas of the Pecos valley red beds, limited as they 

 are, seem to show nearly as intimate a relationship to those of 

 the upper red beds east of the Staked Plains as does the strati- 

 graphy of the deposits in which they occur. In short, there 

 can be little doubt of the identity of the Pecos valley red beds 

 with the Greer and adjacent formations of Oklahoma and 

 western Texas. 



After the Pecos valley and Guadalupe work had been com- 

 pleted, the writer and Dr. G. B. Richai-dson of the federal 

 Survey, who had completed a similar reconnaissance in the 

 Pecos valley and Guadalupe mountains and the i-egion to the 

 northwest, met at Carlsbad and compared results. His results 

 are now published in the April number of this Journal. 



* Fisher, loc. cit., pp. 7, 8. 



f Identical with a Quartermaster form doubtfully referred to this genus. 



