ELIMINATION OF OGDEN QXJARTZITE 527 



the Wasatch Mountains. It is now bereft of its name, since the typical 

 "Ogden quartzite'' must be ruled out. As it is clearly exposed and well 

 marked by fossils east and north of Geneva, it will be called the "quartz- 

 ite at Geneva.^' This formation seems to be best exposed in the northern 

 part of the Wasatch range (see plate 37, figure 1). It is a cream-colored 

 calcareous quartzite interbedded with green shale near the top and bot- 

 tom and altogether not over 400 feet thick. It is doubtless in this 

 quartzite that Weeks found Ordovician fossils. The same fauna, found 

 by the writer at two points near Geneva in 1909, includes the following 

 fossils, as tentatively determined by Mr. E.G. Ulrich : 



Orthis sp. Bathyrus ? congeneris 



Hehertella sp. Bathyrellus sp. 



Macronotella n. sp. Bathyrellus cf. fraternus Billings 



Leperditella n, sp. Symphysurus (?) goldfussi Walcott 

 Primitella n. sp. 



Although most of the species in this list are as yet unnamed, they are 

 correlated by Mr. Ulrich with the fauna of the upper part of the Pogonip 

 limestone of Nevada and the later Beekmantown (early Ordovician) 

 horizon of the Eastern States. 



On the west slope of Mount Morgan, northeast of the town of that 

 name, a corresponding thin quartzite member interrupts the monotonous 

 succession of Paleozoic limestones. In the well known locality in Big 

 Cottonwood Canyon, southeast of Salt Lake City, there appears to be a 

 white quartzite somewhere in the middle of the Paleozoic succession and 

 beneath the thick Mississippian limestone. Its outcrops, however, are 

 badly obscured by soil and brush, and there are igneous intrusions in its 

 vicinity. For this reason its relations and age have not been closely 

 determined. 



THE SILURIAN AND DEVONIAN LIMESTONES 



Kindle^'' has recently shown that the Jefferson limestone of Montana, 

 with a sufficient Devonian fauna, extends southward into the mountains 

 of Utah, and he has traced it along the east side of Cache A^alley, in the 

 Bear Eiver range. He has also identified in the same locality a limestone 

 containing Silurian fossils conformable beneath the Jefferson formation. 

 It was to be expected that the same formations would soon be found also 

 on the west side of Cache Valley, in the Wasatch range proper. As ex- 

 posed on the crest of the range, there is, between the Ordovician quartzite 

 and the identifiable part of the Mississippian limestone, a succession of 

 dark limestones, with some ash gra}^ brittle dolomites having a thickness 



18 E. M. Kindle : Bulletin of American Paleontology, no. 20, Ithaca, N. Y., 1908. 



