EGAN KANGE. 487 



valleys support a considerable growth of pine and mountain-mahogany 

 [Cercocarpus ledifoUus). At the northern point of the range, the fold is very 

 flat, the eastern beds dipping only about 15°, the angle of the western fold 

 being somewhat steeper. The basin of the little interior valley here is par- 

 tially filled by an outburst of rhyolite of white earthy variety, so easily 

 decomposable that but few fresh exposures of the rock could be found. 

 The surface of the white soil resulting from its decomposition is dotted by 

 curious little ant-heaps, often three and four feet in diameter, made up 

 entirely of grains of limpid quartz, in most of which the crystalline outline, 

 which is generally so well preserved in rhyolites, can be still distinguished. 

 From Mahogany Peak south, the axis of the anticlinal fold, which is some- 

 what to the east of the main- crest of the range, gradually approaches the 

 eastern flanks of the range, and at Gosi-Ute Canon the whole series of lime- 

 stones are found dipping west at an angle of 10° to 15°. As exposed in 

 section in this canon, they present a body of close-grained, gray, rather 

 siliceous limestones, with distinct bedding and regular jointing-planes, hav- 

 ing near the base a white crystalline bed. The higher portions which form 

 the main ridge of Gosi-ute Peak are in general a grayish-blue, rather earthy 

 limestone, traversed by thin seams of white calcite, with some interstratified 

 shaly strata. From the upper beds only were any fossil remains obtained. 

 From the upper beds of Mahogany Peak were obtained: 



Productus muUistriatus, 

 Productus suhhorridus, 

 Athyris siibtilita (var. Roissyii); 



from Gosi-Ute Peak were obtained: 



Productus puncfatus, 

 Campopliyllum (frag.); 



while from one of the lower beds in the canon was obtained : 



DipMphyllum, sp.? 



The aspect of these fossils and the great thickness of limestone exposed 

 establish, beyond a doubt, the fact that these beds belong to the Wahsatch 



