EXPLANATION OF SECTIONS. 273 



of the Glacial epoch, while the sky-line of each section represents the final 

 form which water has given to the surface left at the close of the Glacial 

 epoch, whether it be rock or detritus. 



Section J. — In Sectiou J, which crosses Prospect Mountain ridge, the 

 lower portion of Little Ellen Hill, Ball Mountain, and upper Long and 

 Deny Ridge, are seen the main depressions made by the Evans, South 

 Evans, and Iowa glaciers, the outlines of their beds somewhat rounded off 

 by Post-Glacial erosion. The formations are seen to have three broad 

 undulations rather than folds, the two southern of which are broken by 

 faults. 



Section K. — In Section K, which passes through Prospect Mountain, 

 Breece Hill, the head of California gulch, and Long and Derry Hill, the 

 two Evans glaciers had come together in one broad sheet of ice a mile in 

 width and not less than six hundred feet in thickness. Of the moraine 

 material still remaining here, a portion evidently belongs to the lateral 

 moraines, and in the middle is left a i-elic of the medial moraine formed by 

 the junction of the two glaciers. In Iowa gulch at this point, as evidenced 

 by the moraine material remaining on Printer Boy Hill, the Iowa glacier 

 was also about six hundred feet thick and possibly sent a small branch 

 some distance into the head of California gulch. The folds have the same 

 character as in the previous section, but their crests are farther north. 



Section L. — In Section L, which passes through the lower portion of 

 Breece Hill and the west slope of Printer Boy Hill, the bed of the Evans 

 glacier retains about the same size as in the preceding section, although its 

 outlines are somewhat more regular. The Iowa glacier, confined on the 

 north by Printer Boy Hill, had spread out somewhat to the south, leaving 

 its moraine material well on the crest of Long and Derry Ridge. Califor- 

 nia gulch has been cut in the crest of one of the folds mentioned above, and 

 in it the lower sheet of Pyritiferous Porphyry is seen to be cutting across 

 the formations. 



Section M. — Sectiou M, passiug through the crest of Yankee Hill and 

 just east of Iron Hill, shows the Evans glacier split again into two streams, 

 having a total width of over eight thousand feet, but whose thickness is 



MON XII 18 



