42 GEOLOGY OF MOOSE RIVER GOLD DLSTRICT — WOODMAN. 



Summary of Moose River folding. — The theoretical consid- 

 erations regarding these and other folds in the Meguma 

 will be given in a subsequent paper on the structure of the 

 series. It is sufficient here to recapitulate the conditions found 

 in the field. 



The simplest structure of this type is the elliptical dome> 

 striking roughly east and west. * The modifications in Moose 

 River are such as to distinguish the region from all others : — (1) 

 two main axes instead of one, giving two anticlines, both of 

 great extent along the strike and prominent in the structure of 

 the series ; (2) their convergence westward and final union 

 within the limits of the district ; (3) the presence of a thick 

 slate horizon, included in both folds and overlain by massive 

 beds of quartzite, instead of the alternate whin and slate strata 

 of other domes. This makes possible (4) the puckering up of 

 part of this slate belt into an intermediate anticline, itself com- 

 pound, and probably dying out east and west within a compara- 

 tively short distance ; (5) the plunging of the axes of the main 

 folds, not at both ends as in an ideal case, but one eastward, the 

 other westward; and (6) the plunging of the intermediate fold 

 eastward, or in the direction of divergence of the axes of 

 the main anticlines. It probably broadens and flattens out 

 until gradually lost ; yet there is some evidence that it, or 

 another in its place, exists six miles east, near Otter lake, where 

 the two main folds are half a mile apart. 



The vertical thickness of sediments involved, between No. 7 

 on the north and the veins in the center of area 970 block 4, oa 

 the south, is only about 370 feet. 



FAULTS. 



Classes of movements. — The faults of the Meguma series fall 

 for the most part into two large types — cross faults, cutting 

 across the strike of the long folds at high angles, and often ex- 

 tending for miles ; and radial faults, striking outwai'd on 

 the plunging ends of domes. There are some that are outside 



