188 THE PENOKEE IKON-BEAKING SEIUES. 



widening comes in again. This is evidently due t(i a change in course of 

 the iron Itclt, which now trends southward, and tluis diverges from the 

 Keweenawini l)eds, tlie divergence, however, not Ijeing so great as to 

 allow the reap|)eara.nce of the slates belonging above the Iron-bearing 

 member as far east as the middle of T. 47 N., R. 44 W., Michigan. 



Tnpor/raphical features. — The Penokee iron range, save for several trans- 

 verse cuts made through it by the northward tlowing streams, is a contin- 

 uous ridge from the northern half of Sec. 24, T. 44 N., R. 4 W., Wisconsin, 

 eastward to l)e\'ond Sunday lake in Michigan. To the west of the western 

 termination of this range, as indicated in previous chapters, are again 

 other detached ranges, which, being made up of like strata dipping in the 

 same northerly direction, may be looked upon as forming portions of the 

 same general line of elevation. The same is true east of the eastern 

 termination indicated as far as the vicinity of the Little Presque Isle 

 river. In places the ridge rises from 100 to 300 feet above the elevated 

 swampy area south of it, and from 100 to 600 feet above the lower area 

 north. In its more western portions this range is wide and has a rather 

 narrow serrated crest, while eastward from Tylers fork it becomes more 

 and more of a gentle swell until a point west of Sunday lake is reached, 

 where there is again a broader range. In much of this distance the ridge 

 forms the most prominent feature of the topogra))hy of the country, being 

 visible from the waters of lake Superior in the vicinitv of the Apostle islands 

 •as a blue line against the horizon. On a preceding page the relations of the 

 Quartz-slate member to this ridge have been indicated, and incidentally those 

 of the Iron-bearing member also. The points of principal interest, hoAvever, 

 may convenientl}' be repeated here. Along that portion of the Penokee 

 range which is west of Bad river, and also in the detached ranges above 

 refeired to as occurring still farther west, in T. 44 N., R. 5 W., Wisconsin, 

 the Quartz-slate member forms the foot of the Itold south face of the ridge, 

 the upper portion of the southern face, along with the crest and tlie up))er 

 portion of the northern slope, being all made up of the steeply inclined 

 layers of the Iron-bearing mend)er. The passage of Bad river through the 

 range has been determined b}' the existence of a fault, which has caused 

 a discordance in the layers of some 800 feet. Eastward from Bad river the 



