PALiEOZOIO FORMATIONS OF THE PlITON RANGE. 557 



and Devonian limestone. The former occurs as rolling foot-hills, overlaid 

 by ridges and walls of the latter, with a dip of 30°. 



As regards the palseontological evidences of the age of the Pinon 

 Range, it may be said that from only one locality have organic remains 

 been found in the lower body of limestone, and these were confined to 

 stems of corals too poorly preserved for specific determination. They were 

 found in a blue cherty bed near the entrance to Cave Caiion, and, coming 

 from the upper members, are of some special interest, as Prof. R. P. Whit- 

 field regards them as belonging to the horizon of the Lower Helderberg of 

 the New York section. From several localities in the range, however, the 

 Wahsatch limestone has yielded fossils which have been referred to the 

 Devonian age, the association of forms clearly indicating the Upper Hel- 

 derberg beds. In one instance, there would appear to be a mingling of both 

 Lower and Upper Helderberg forms ; but, according to Professor Whitfield, 

 all the forms might possibly occur in the Devonian beds. With Lower 

 Helderberg fossils near the top of the underlying limestone, and Upper 

 Helderberg forms near the base of the overlying limestone, the palseonto- 

 logical evidences certainly favor a conclusion that the Ogden Quartzite is 

 the equivalent of the Oriskany sandstone in the New York section. 



In the region of Hot Spring Creek, the limestone furnished the follow- 

 ing forms : 



Dalmania, sp.'? (closely resembles D. ancJiiops 

 from the Schoharie Grit of New York). 



Edmondia Pinonensis (associated on the same 

 block with OJionetes and Spirifer). 



Orthis ohlata. 



Orthis, sp.? (resembles 0. quadrans). 



Strophodonta, sp.? 



Spirifer Pinonensis. 



Spirifer, sp.? (resembles S. arenosa) 



Atrypa reticidaris. 



BhynchoneUa, sp.l 

 Several species of BracMopoda, found in the above list, were also col- 

 lected from the summit of Fossil Pass. 



