GEOLOGICAL SURVEY OF THE TEREITORIES. 



195 



ferruginous, from 2,0G0 to 2,500 feet in thickness 

 in it, and I know of nothing which 

 woukl give any grounds for judging 

 as to its age. 



This is followed by probably 3,000 

 feet of qnite compact, mostly thin- 

 bedded gray and drab limestone, 

 largely silicious, the lower part even ^ 

 cherty and somewhat geodiferous. g 

 These beds contain a few fossils, | 

 Zaphrentis, &c., which are plainly g 

 of Carboniferous age. -g. 



These higher beds make no ap- g 

 pearance upon the western slope of '-, 

 this mountain-block, except in the - 

 immediate neighborhood of Ogden 5 

 Cahon. The crest of the mountain § 

 consists of the lower q-uartzites, as | 

 shown in the section previously ° 

 given. TheujDper of the twosubor- f 

 dinate folds on the western slope has t 

 its eastern side much steeper than I" 

 its western, and at some points al- ^a. 

 most pinched out. The lower aud ^ 

 more westerly one has both sides ? 

 quite steep, and the two edges of | 

 the thin plate of limestone which | 

 forms its central portion are folded § 

 so closely together as to appear, at 's- 

 first sight, when seen from below, S 

 near the limekiln, like a single out- f 

 crop ; higher on the sptir, where | 

 they perhaps spread a little more f 

 than they do below, the eastern edge -^ 

 has a dip of only from 50° to 53°, g 

 and the western one of 75°. E 



The following is a section of the I 

 strata as they are exposed in Ogden f 

 CaQon. (Fig. 45.) The two subor- 2 

 dinate folds of the western slope of -^• 

 the anticlinal, having more westerly ^ 

 trends than the mountain-range it- ^ 

 self, pass under the valley before g 

 reaching Ogden Caiion, and, accord- | 

 ingly, are not seen in this section, g 



In ascending tile stream the first i- 

 grand fold of the upper limestone is |^ 

 so much concealed by the debris as "^ 

 to be unnoticed until we pass the 

 second bridge and come to the 

 "wedge" figured in the report of 

 1871, and eA-en then it is difficult to 

 trace the outlines of the fold on the 

 upper slopes. The second fold, how- 

 ever, is very prominent, forming an immense 

 mountain-side, a half mile long and at least 



No fossils were seen 



