a King—Oeology of the 4:0th Parallel 477 



Lingulepis Ifer, n. sp. Crepicephalus (Loganellus) simulator. 



Kutorgin; 



Paradoxides ? Nevadensis Meek. 



Conocephalites (Ptyehoparia) Kingi 



Conocephalites (Pterocephalus) 1 



Conformably overlying the summit shales of the Cambrian is 

 a body of limestone, which in the Wahsatch has a maximum 

 development of 2,000 feet, thinning out along the southern 

 part of our belt of country in the region of the Little Cotton- 

 wood canon of the Wahsatch to 1,000 feet. This group, to 

 which we have given the name of the Ute Limestone, has 



In western Nevada the calcareous shales of the Potsdam 

 and the limestone of the Quebec have enormously thickened, 

 and the whole body of Silurian and calcareous upper Primordial 

 represent from 4,000 to 5,000 feet of continuous limestone, in 

 which were found fossils of the Lower Helderberg, Niagara, 

 Quebec and Primordial. In the Wahsatch_ it is certain that the 

 Ute limestone is, with the exception of possibly a few thin mem- 

 bers at the top and at the extreme bottom constituting an insig- 

 nificant fraction of the whole zone, altogether of Quebec; while 

 in the middle of Nevada, in the region of White Pine, Robert's 

 Peak and the Piiiou Mountains, more than half of the heavy 

 body of limestone is Primordial, a very limited amount is Que- 

 bec, and a very large portion of the upper part of the series — 

 exact horizon's being yet undetermined — is occupied by the 

 Niagara and Lower Helderberg. The Quebec is represented by 

 the following fossils : 



iJngulepis Ella, n, sp. Eaphistoma acuta, n. sp. 



" • Lingula, sp. ? Maclurea minirna, n. sp. 



Cyrtolitea sinuatus, n. sp. 



-3 Pogonipensis, n. sp. Conocephalites subcoronatus, n. sp. 



IjepUena meKta, n. sp. Crepicephalus (Loganellus) quadrans, 

 Strophomena nemia, n. sp. n. sp. 



Porambonites obscurus, n. sp. Dicellocephalus gothicus, n. sp. 

 Rtynchonella, sp. ? fragments only. " quadriceps, n. sp. 



Ophileta complanata, var nana Meek. " Wahsatchensis, d. sp. 



Euomphalua (Eaphistoma) rotuliformis Bathyurus Pogonipensis, n. sp. 



Meek. Ceraurus? sp. 



Euomphaius (Raphistoma) trochiscus Ogygia paraboloidalis, n. sp. 



Meek. " producta, n. sp. 



Am. Joub. 8ci.— Thikd Series, Vol. XI, No. 66.-June, 1876. 



