STRUCTURAL DETAILS OF THE CONTACT 155 



contact is exposed continuously for at least 500 feet to and beyond 

 the point where the carriage road to the cave of the Winds turns to ascend 

 the mountain. For the first 300 feet or so the granite is highly laminated 

 or gneissoid, as shown in Hayden's figure (1, on page 142), the structure 

 planes dipping north and northwest 30 to 60 degrees. There are only 

 slight indications of conglomerate along this part of the contact, except 

 the scattering small rounded quartz pebbles. The contact is not broken 

 by any clear faults in the Williams Canyon section, the influence of the 

 Ute fault apparently not extending so far to the eastward, and aside from 

 the boss and the broad undulations of the granite surface, the original ero- 

 sion irregularities are all on a minor scale. Figure 31 shows the contact 

 on the west side of the road, on the southern slope of the boss. It is 

 very clear that the stratification of the sandstone adapts itself to all these 

 minor inequalities, filling hollows before it covers elevations, but it seems 

 to curve regularly and evenly ^ 



.overthe main swells of granite, .•.•.•.•.-.•.-.• • ■ .•.•.-.•.•.■ ■ • 



although these, too, are prob- 

 ably original erosion forms. ^+'^+'^ + + +^ 

 Continuing up the canyon, the "*" '^'^+\\*+^ 

 granite, of varying characters, , . , /, r 



is exposed almost contin- 



1 1 , ,1 , , ^ Figure 32. — Oriqinal Erosion Hollow in the Contact Surface. 



uously, but the contact onl}^ 



rarely. On the east side, about a mile north of the carriage road, I noted 

 the original irregularity shown in figure 32. The contact rises more rap- 

 idly than the bottom of the canyon, and crosses without satisfactory 

 exposures the broad ridge or spur of the mountains between Williams 

 canyon and Queens canyon, on Camp creek. 



Going up Camp creek, the narrow passage through the Dakota hog- 

 back forms a gateway to the beautiful expansion of the valley in the 

 vertical red beds known as Glen Eyrie, and the canyon proper begins 

 with the Manitou limestone, dipping east or east by south 10 to 15 degrees. 

 Conformably below the limestone we have the Cambrian sandstone, as 

 described by Peale, resting on the granite, which is largely gneissoid. 

 The contact is exposed almost continuously on the precipitous walls of 

 the canj^on for half a mile to a mile above Glen Eyrie, and as usual, it 

 is almost devoid of relief features, one or two slight faults and several 

 small hummocks due to concretionary forms in the granite being all that 

 I could make out. 



Summary of the structural Fe.atures of the Contact 



The general views of the contact afforded by the canyons and the 

 intervening ridges show conclusively that it is practically a plane for the 



