388 J. S. DILLEE — GEOLOGY OF THE TAYLORVILLE REGION. 



and southeast, so that the formations of the different geologic horizons 

 appear in belts crossing the region in that direction. The long section 

 represented in figure 1 crosses these belts approximately at right angles, 

 and shows not only the positions of the strata observed, but also, in sonic 

 cases, their connection beneath the surface. 



It is evident that the strata have been either folded or faulted, or both, 

 to bring them into their present position, and it is important to determine 

 at the outset, if possible, the influence of each in developing the general 

 structure. 



A glance at the section of the region shows us that there are two belts 

 of older strata — one in Grizzly mountain and the other in the vicinity of 

 Hosselkus creek. These are both flanked on either, side and separated 

 by belts of younger strata : but all the strata, both older and younger, with 

 rare exceptions, dip southwestward. This distribution might arise from 

 either folding or faulting. It so happens, however, that in the north- 

 eastern belt of older strata the anticlinal structure is evident, and in the 

 middle area of newer ones the synclinal arrangement is clearly indicated. 

 There is good reason, therefore, for regarding the two masses of older 

 formations as brought to the surface by anticlinal folds rather than by 

 faults; but. as already seen in mount Jura, the folding and overturning 

 of the strata may have been followed by displacement. 



Genesee Anticlinal. — The Genesee anticlinal is best exposed on the 

 northern slope of Genesee valley, where the Trias is arched unconform- 

 ably over the Carboniferous, as represented in figure 2 (page 378). 



Near the crest of the divide between Hosselkus creek and Genesee val- 

 ley, not far from Robinson's, where the Hosselkus limestone passes over 

 to the eastern side of the anticlinal, it disappears on the western side, 

 its place being taken by a belt of eruptive rocks which borders the anti- 

 clinal immediately upon the west throughout its whole extent. On the 

 eastern side, however, close to the axis, the Hosselkus limestone is well 

 exposed along Hosselkus creek, ascending its western branch to near 

 the Taylor diggings, u here it is intercepted by eruptive rocks but reap- 

 pears, as already stated, in the southwestern branch of Peters ravine, 

 associated with Carboniferous and Jurassic strata. 



The eastern arm of the anticlinal is very irregularly limited by eruptives. 

 Near < ienesee valley it is cut off by the diorite, leaving only a. narrow bell 

 of the Triassic slates, which are turned up near the contact and converted 

 into hornfels. Further northward it suddenly expands, near Hornf els 

 point, into a broad wedge-shaped area of the Trail beds, which are sup- 

 posed to be Triassic. The area tapers rapidly northwestward under the 

 encroachment of the eruptives from Kettle Rock mountain, which com- 

 pletely cut off the Genesee anticlinal on the southern slope of Peters 

 ravine. 



