300 DESOEIPTIVE GEOLOGY. 



dipping conformably in the lower portion of the cliffs. Higher up, these 

 red beds bend in an S-shaped curve from 60° to a horizontal position, and 

 then still higher on the cliffs assume an angle of 45° south, the con- 

 tinuity of the beds being distinctly traceable through all these changes of 

 dip, while their strike bends off 30° to the north of west, almost at right 

 angles to that of the strata on the east side of the canon, which is about 

 southwest. Above the gateway of the canon, separated by a gap without 

 outcrops from the overlying Triassic sandstones, were found outcrops of the 

 bluish-drab limestones of the Upper Coal-Measure ; while the canon above, 

 which was not explored, runs nearly in the strike of the beds, and in it, as 

 well as could be seen, the strata of Weber Quartzite stand at a much lower 

 angle than the upper beds. From some blue limestones, apparently above 

 the Jurassic outcrops mentioned above, but evidently not in place, were 

 obtained the following Coal-Measure forms: 



StreptorliyncJius crassus. 



AtJiyris subtilita. 

 Whether these were fragments, or whether, which seems hardly possible, 

 there has been an inversion of beds, was not satisfactorily determined. 



Where the next large stream to the west, the western branch of Ute 

 Fork, emerges from the mountains, though the Tertiaries have been very 

 considerably eroded, the accumulations of moraine material are so great as 

 to cover almost all the outcrops laid bare by this erosion; and of higher beds 

 than the Upper Coal-Measure limestones, the only indication found was an 

 outcrop of white sandstone near an eastern branch of the main stream, which 

 was supposed to belong to the Triassic formation. The narrow ridge separat- 

 ing this branch from the principal stream is formed by a huge lateral moraine. 

 A short distance farther up this eastern branch, a blue limestone outcrop, 

 dipping about 30° south, closes up the basin-like head of this creek, while 

 the steeper slopes near its source show outcrops of a whitish limestone, 

 having a dip of but little over 10°, which would explain the apparently 

 exaggerated width of outcrop of the Upper Coal-Measure group as indi- 

 cated in the map at this point. The range was crossed here, coming from 

 Burro Peak through the basin at the head of Antero Cafion, and over the 

 spur which separates the two main branches of Ute Fork. On the surface 



