394 DESCRIPTIVE GEOLOGY. 



In the lower caiion of tlie Weber River, a section is seen of the northern 

 portion of the Farmington Archaean body, here consisting largely of gneisses, 

 containing hornblende and pink feldspar, and frequently having a greenish 

 color, due to the presence of epidote. These beds have here, as, indeed, 

 wherever observed in the range, a westerly dip; the dip is, however, much 

 steeper than to the southward, averaging about 40°, but frequently having 

 a much higher angle, owing to local contortions of the strata. The sides of 

 the caiion are extremely rugged and precipitous, and the scenery is of quite 

 an alpine character, especially at the ]3oint known as the Devil's Gate, where, 

 owing to a local fold, the stream, makes a sharp curve to the northward,, 

 running a short distance with the strike of the beds. On the southeast face 

 of the mass of hills north of tlie canon, as seen from Morgan Valley, just 

 above the entrance, is an appearance of an anticlinal fold in the strata 

 where the Cambrian beds are seen dipping steeply to the northeast over the 

 edges of the southwesterly-dipping Archaean beds. 



Ogden Region. — Ogden Peak, which is one of the most prominent and 

 picturesque peaks of this part of the range, and forms the culminating point 

 of the mass of hills between the Weber and Ogden Rivers, is capped by 

 quartzite beds belonging to the Cambrian formation, which lie unconformably 

 upon the edges of the Archaean beds, exposed on its southern and western 

 slopes. They dip -steeply to the eastward, and strike north 15° to 20° west. 

 Near the summit is a well-defined bed of compact conglomerate, containing 

 flattened pebbles of polished quartz, corresponding to the bed found in Ogden 

 Caiion, which will be described below. A detailed section of the strata on 

 the east slopes of the peak was not obtained, owing to the dense growth of 

 trees and shrubs; but the Wahsatch limestone was traced along the base for 

 a considerable distance southward from the head of Ogden Canon to where 

 it runs under the red and buff sandstones, which have been referred to the 

 Vermillion Creek series. On the northeast side of the peak is a broad 

 amphitheatre, with steep, pi-ecipitous walls several hundred feet deep, which 

 has been carved out of the quartzites. In the canon below, glacial indica- 

 tions are everywhere to be seen in its pohshed walls, rounded basins with 

 ice-markings and scratches, and well-defined moraines. 



On the west face of Ogden Peak, evidence is seen of a powerful disturb- 



