RESUME OF LITERATURE. 35 



noted b}" White must be accepted. In a condition thus unsatisfactory, without 

 having- attained to more than the probabilities, it seems necessarj^ to turn from this 

 point until fresh evidence is obtained. 



From the upper Aubrey group in the Uinta Mountains only a meager fauna 

 is known. White cites Bellerojyhon carhonariu-'i var. suhjyajnUosus from Junction 

 ^Mountain and near Diamond Peak, in northwestern Colorado; and in Utah, from near 

 Echo Park, BeUerophon carhonari.us var. siibpapillosus, and from Beehive Point, 

 near Horseshoe Canyon, Discina sp., Hefmipronites crenistria, Spirigera sicbtilita^ 

 Splnfer rockyniontanu>i^ and BeUerophon carhonarlus var. suhjyapiUosus. This fauna, 

 so far as it goes, indicates again the Upper Carboniferous, without any suggestion 

 of Permian, as AVhite also has remarked. 



Gypsum and Cataract canyons, where the only collections from the Red Wall 

 limestone were made, and the junction of the Grand and Green rivers, where the 

 largest collections representing the lower Aubrej"^ group were obtained, are close 

 together, southeast of the center of Utah. In this region, as the Lodore group was 

 not, 1 believe, identified outside of the Uinta Mountains, the Red Wall group is the 

 lowest of the Carboniferous formations. Its fauna has already been spoken of, and 

 the opinion expressed that it indicates in an inconclusive but at the same time an 

 unambiguous manner the age of the Upper Carboniferous. 



From the lower Aubrey group at the junction of the Grand and Green rivers 

 a considerable and characteristic fauna is cited, as follows: Fistulipora sp., Syringo- 

 pora sp., Lophophyllum jyi^'^Hf^um, Arcliieocidaris cratis, Arch'socidaris trudlfer, 

 Erisocrinus typits, 8cap>Mocrin-us carhonarius, Eupachycrinus j^latyicisw, Polypora 

 sp., Productiis pimctatiis, P. longisjnnus {V),P. p>rattefnianus, P. semiretlculatus var. 

 ivesii, P. nebrashensis, P. midtistriatus, Chonetes gra/aulifef)', Hemipronites crenistria, 

 Meekella striatieostata, Seminula suhtilita, Spirif&r cameratus, Spiriferina Tcentucky- 

 ensis, Myalina recurvirostis, Allerisma subcuneatum, Edinond'm asj>i>iwallensis, Pleu- 

 rophonis sp., Schizodus wheeleri, BeUerophon sp., Euoinphalus sp., Pleurotoiaarla 

 excelsa, and Naticopsis remex. This fauna has no uncertain significance, and evi- 

 dently belongs in the Upper Carboniferous. 



At the same locality, but in the upper Aubrey group, was obtained the following 

 fauna: Spiriferina hentucl'yensis^ 2£yalina sp., Edmondia sp., and BeUerophon mont- 

 fortianax. Though scanty, this fauna is indicative of Upper Carboniferous, and such 

 a determination is in line with its position in the section above a well-characterized 

 Upper Carboniferous fauna. In the four species cited there is nothing to lead one 

 to assign the horizon to the Permian. 



The comparison of these faunas with those in the Uinta Mountains supposed to 

 come from the same beds is full of interest. Of the thirty species which are cited 

 from the lower AuVjrey group iit the junction of the Grand and Green rivers, but 



