OGDEK REGION. 395 



ance in the beds which make jip this part of the range, resulting in the 

 development of sharp folds almost at right angles to the main anticlinal fold, 

 and in a faulting and dislocation which has lifted up and carried back the 

 mass of Ogden Peak relatively to the rocks exposed to the north in Ogden 

 Canon, so that, as will be seen by reference to the map, the ends of the 

 beds of Wahsatch limestone of Ogden Canon come against the Cambrian 

 quartzites of Ogden Peak. A sharp fold, whose axis follows generally the 

 line of fault, could not, however, be indicated in the small scale on which 

 the map is engraved. The evidence of this faulting is best seen in Fault 

 Canon, next south of Ogden Canon, which heads directly under the west 

 face of Ogden Peak. To the north of this point, the structure of the 

 range is that of a series of easterly-dipping sedimentary formations from 

 the Cambrian up, resting on an Archaean body which is exposed only along 

 the extreme western foot-hills. Along the face of the hills, the edges of 

 these overlying strata can be traced as an approximately horizontal line, 

 descending somewhat in either direction from Ogden Canon. To the north 

 of the entrance to Fault Canon, the Cambrian quartzites form the upper 

 portion of the spur, with a slight inclination westward, while its base is 

 masked by debris. The ridge on the south of this entrance is formed of 

 beds of limestone, probably the Ute limestone, which, while sloping gener- 

 ally westward with the ridge itself, are folded sharply over it, dipping 70° 

 to the north and much more gently south. Curving up again along the 

 southern foot-hills with a northern dip, they are succeeded by quartzites, 

 also dipping north and east, which rest on the upturned edges of south- 

 westerly-dipping Archaean strata. The head of Fault Canon, under the base 

 of Ogden Peak, is in the gneisses of the Archsean again, which are overlaid 

 non-conformably by the quartzites which form the summit of the peak, 

 while in the bottom of the lower portion of the canon are also obscure out- 

 crops of Archsean rocks, the intermediate portions being filled by quartzite, 

 which seem to dip into the canon from the north. It is considered, there- 

 fore, that the limestones and quartzites to the south of the canon are a faulted 

 portion of the western member of the Ogden Peak fold, and that the crum- 

 pling of these beds has been caused by forces of compression acting in the 

 direction of the axis of the range, which forces have produced a dislocation 



