4() CAHIiONIKKUUHS FORMATIONS AND KAUNAS OK COLORADO. 



Wiisiitch jMount'.iiii.s this division contains some striking- and peculiar sjiecies. I 

 collected Pr<><litcti(x iicrarh'nfiiK, PrdiJiirtus iiit(lti><tri(iti(K, ISjnri/ferina ■pulclmi^ and 

 scNcral other I'ornis. few of whicli prohahly are known in tlio Mississippi Valley, 

 from this horizon in Weber Canyon. A somewhat similar fauna is cited by Emmons" 

 from Mill Creek Canyon — Spirifi'v caineimtim^ Sj>i.rifev octopllccdxm^ Sjnrifcrina 

 pvlvhra, and Ih'oduvtux ■siibkorridm. Some of these forms are cited from the same 

 horizon in the Uinta Mountains. From the foothills bordering Kamas Prairie were 

 C)litained l'r<i<h«'tiix xeinireticulatus, Sjairiferina ptdclira^ and Martinia lineataJ' 

 This locality, however, is in the western end of the range, and so far as known these 

 interesting forms do not appear east of this point. In the eastern Uintas the fauna 

 of the Upper Coal Measures, except for the Bellerophon limestone, which I shall 

 speak of later, comprises only the usual Pennsylvanian types. From Zenobia Peak" 

 are cited S/iirifer l!n<-atiis and Spirifer opiinus; near Ute Peak '' Spiriferina ken- 

 turl'tjensis, Seminula suMllita, and MeekeUa striaticostata. 



Emmons also states that Marsh found at this horizon, and apparently very near 

 this same loc^W.ty,'-' Zaphrentis stansburyif, Fenestella sp., Deriya crassa. Prodtictus 

 sp., Sph'ifi'f cdmeratus, /Seminula subtilita, and Philli])&iaf sp. These are from the 

 eastern end of the range, and present no seeming departures from the usual faunas 

 of the Mississippi Valle}^ Pennsylvanian. 



A somewhat peculiar assemblage of species, however, is found in the Bellero- 

 phon limestone, whicli forms the upper limit of the Upper Coal Measures division 

 of these authors, or the topmost bed of the Carboniferous of Powell and White. 

 From this horizon at Vermilion Creek Canyon ai'e cS.tQA-1' Fusulina sp., Nucula parva, 

 Sedgwickia concava, Pleurotomaria sp., Bellerophon carbonarms; from Section 

 Ridge ^ JV'ucidana hellistriata, Schizodus curtus, Bellero2)hon carbonarius, Orthoceras 

 crih^osum, Naiadites sp. ; from Geode Canyon a similar fauna.'' It should be added 

 that of the species cited Belleroplwn carbonarixbs is JEwphemus svhpapillosus; Ortho- 

 ceras cribrosum is Dentalitirn cf. canoia, and JVueulana bellistriata m Leda ci. obesa. , 

 These stations are all situated toward the east end of the Uinta Mountains. Though 

 this fauna is not cited from the western portion of the range, nor from the Wasatch 

 Mountains, it should not be lost sight of that the horizon is believed to occur in that 

 area. King says:' "The prominent capping chertj^ limestone is quite constant wher- 

 ever in the Uinta a good section of the whole Coal Measure series is obtained, and it 

 is to be considei'ed as'the dividing line between this group and the Permo-Carbonif- 

 erous." This remark refers to the Uinta Range, while the following is made of 

 Cottonwood Canyon, in the Wasatch Range:-'' "A continuous belt of limestone, about 



a U. S. Geol. Expl. 40th Par., Rept., vol. 2, p. 3SS. / U. S. Geol. Expl. 40tli Par., Kept., vol, I, p. 142; vol. 2, p. 274. 



!>Weni, vol. 1, p. 321; vol. 2, p. 147. » Idem, vol. 1, p. 144; vol. 2, p. 285. 



c-Idem.vol. 1, p. 144; vol. 2, p. 287. Mdem, vol.1, p. 145; vol. 2, p. 291. 



d Idem, vol. 1, p. 145; vol. 2, p. 289. » Idem, vol. 1, p. 143. 



« Am. Jour. Sci., March, 1871, p. 197. jibid., p. 171. 



