Hn*TZE, GEOLOGY OF WASATCH MOUNTAINS, UTAH m 



about midway between Ogden and Salt Lake City and includes the 

 Eureka district of l!s'evada in the southern division. Since, however, the 

 Nevada limestone fauna shows close affinity with the Jefferson rather 

 than the Ouray, the line which separates the latter from the Jefferson 

 and Nevada limestone faunas must curve to the south somewhere in 

 Utah. It should be expected that these two distinct faunas representing 

 different parts of the Devonian, the Jeft'erson, Lower and Middle, and the 

 Ouray, Upper, will overlap somewhat, but thus far no section has been 

 found where this condition is shown. 



Ouray Type of Devonian in the Central Wasatch 



It was with very great interest that the writer discovered Camaro- 

 tcechiu endlichi and a number of other typical Devonian forms in the 

 Cottonwood region. On Montreal Hill, near the head of Mill D, South 

 Fork, in Big Cottonwood Canyon, occur very fossiliferous light blue lime- 

 stones, at the base of which the following forms were obtained : 



Schuchertella chemungensis Hall 



OrtJioceras sp. 



Spirifer orcstes var. wasatchensis var. nov. 



Spirifer sp, 



Fenestella sp, 



Rhynclionella sp. 



Immediately overlying this horizon and ranging through about 250 

 feet of limestones occur the following forms : 



Euomphalus utahensis Hall and Whitfield 



E. luxus White 



E. ophirensis H. and W. 



Spirifer orestes var, wasatchensis 



In a third richly fossiliferous horizon, in which Spirifer orestes var. 

 wasatchensis and Eunella linMa^ni are the most abundant, practically 

 making up the body of the limestone, occur the following : 



Spirifer orestes var, wasatchensis 



Eunella linJdwni Hall 



Cystodyctia gilherti Meek 



Euomphalus cf. cyclostomus 



Athyris coloradensis Girty, cf. .1. hrittsi Miller 



Aviculopecten sp, 



Camar'otcEchia sp. 



Cryptonella ? circulata Walcott 



Euomphalus ophirensis H. and W, 



