SUMMIT REGION WEST OF LODOEE CASTON. 289 



Above this are about 50 feet of coarse white sandstone, over which lie 

 limestone-shales, and about 150 feet of fine-grained blue limestone, having 

 almost a conchoidal fracture, very rich in fossils, from which, however, owing 

 to the compactness of the rock and the smooth surfaces exposed, it was 

 difficult to obtain good specimens. The fossils obtained here were : 



Spiriferina Kentuckensis. 

 Athyris subtilita. 

 Meekella striato-costata. 



With the exception of two mollusks. found at the head of Bear River, 

 Utah, these are the lowest fossils found in place in the Uinta Range. 



Professor Marsh,^ in his exploration of these mountains in 1870, found, 

 at this horizon, and apparently very near this same locality, specimens of 

 a Productus, Spirifer cameratus, Athyris subtilita, Hemipronites crassus, Za^ 

 phrentis {Stansburyi f), and fragments of Fenestella and PhiUipsia (?). 



The dip of the beds at this point is about 15° a little west of south, but 

 to the eastward, toward the canon, the beds apparently steepen, and dip 20° 

 to the southwest. In the hills to the west of Ute Peak are exj)osures of 

 other limestones, apparently occupying a higher horizon than these, and 

 yellow and purplish sandy shales, full of flinty concretions. In one seam 

 of blue limestone at the base of these hills were found fragments of Syrin- 

 gopora, and a Spirifer, representing approximately the same horizon with the 

 Ute Peak beds. Mount Lena is formed of the beds of the glistening red 

 sandstone, dipping 7° to 10° south. The inclination of the Weber Quartzite 

 beds decreases from here northward, and the northern axis of the range lies 

 apparently just north of the divide, where the Indian trail descends into Ash- 

 ley Park. Between Mount Lena and Marsh's Peak lies an open basin coun- 

 try, about 10,000 feet above the level of the- sea, densely covered with forest. 

 Of that portion lying between the two Indian trails indicated on the map, 

 our knowledge is derived from distant observations and from the sections 

 obtained on these two trails. All of the northern foot of the ridge which 

 bounds this basin on the north has a gentle southerly dip, varying from 3° 

 to 7°. This gentle dip is more continuous here than in the range farther 

 west, and extends southward into the portion covered by the beds of the 



* Amer. Jour. Sci., Mar., 1871, 197. 

 19 D G 



