334 THE VERMILION IRON-BEARING DISTRICT. 



in-eg-ulai- masses wliicli have just been mentioned are pebbles derived from 

 it and lying in the conglomerate. While one can understand how this 

 interpretation could be made, the conglomerate above the jasper band being 

 regarded as evidence of another structural break, nevertheless the undoubted 

 bands of jasper in the conglomerate, and the certainty that many of these 

 irregular areas are derived from these bands and owe their character to 

 dynamic agencies, are strong evidence against this view. It may be sug- 

 gested that it is very probable that some of these irregular masses may be 

 due to a later infiltration of jasper material. 



The interbanding of the jasper, slate, and conglomerate is particularly 

 well seen about 50 paces west of the trail near the top of the hill. Here 

 in a width of 6 feet one may count 6 distinct bands of jasper interbedded 

 with fine graywacke and slate. The bands which were counted as jasper 

 bands contain thua laminae of slate ranging from a fraction of an inch to an 

 inch across, and, vice versa, the bands counted as clastic sediments contain 

 minute bands of jasper. At this place the extreme mashing to which the 

 rocks have been subjected in this area is beautifully illustrated. The 

 jasper is plicated in an extremely complex manner. In some places it 

 bends without major fractures, and in others it has broken through and 

 through. In places narrow bands of the jasper are severed by diagonal 

 shearing planes into areas which are now more or less lenticular in shape, 

 and may be immediately in juxtaposition or somewhat removed from one 

 another. In the clastic sediments lying between the continuous jasper 

 bands there are some angular and roundish areas of jasper, but these 

 appear to have been derived by dynamic action from the continuous belts 

 of jasper, and not to be clastic fragments deposited by water in their 

 present place. The whole is made more complex by secondary veining 

 and jasperization of the rocks since the folding of them took place. South 

 of the last-mentioned jasper belt, there occurs, measured across the strike, 

 about 50 feet of graywacke, slate, and conglomerate. On the south side of 

 the exposure this material changes into a fine-grained conglomerate which 

 in the space of 3 or 4 feet grades up into a slate which underlies the 150 to 

 200 paces intervening between the last jasper exposure on the ridge and 

 Moose Lake. A close examination of these jasper bands on the hills shows 

 that the second one to the south, which lies between two ridges of con- 

 glomerate, is of just about the same width as the jasper band which appears 



