GEOLOGY OF MOOSE RIVER GOLD DISTRICT — WOODMAN. 63 



far north as the north side of the subsidiary syncline. In the 

 latter, it extends to the north side of the subsidiary anticline, 

 and appears to be pinching out at the north side of the quarry. 

 None of the leads first worked, on the north dip of the north 

 main anticline, have been found on the intermediate or south 

 anticlines. 



C ren Illations : relation to stratification. — Two detailed fea- 

 tures of the attitude of the veins are crinkling and "rolling". 

 The former is very characteristic of this district, and is found in 

 both stratified and cross veins. It consists in a corrugation of 

 the whole width of the vein, coarse or fine according to the 

 thickness of the latter, and in strict conformity with the bedding 

 in the stratified ones. The lamination of the slates follows the 

 crenulations of the lead, exactly when near it, less faithfully 

 when farther away. 



Crenulations : variation in size and shape. — The amplitude 

 and interval of the curves vary greatly, apparently depending 

 upon the size of the vein and the proportion of arenaceous 

 material in the country rock adjacent. The west side of the 

 quarry on area 76 shows this feature. Here, bounded only by 

 slate, are very many stratified veinlets of quartz. In some there 

 is a thinning of the vein from half an inch down to one-quarter 

 or one-eight of an inch in thickness. Accompanying this is a 

 gradual and proportionate diminution in the size of the corruga- 

 tions made by the veins. A few inches above and below, the 

 slate laminae are undistiirbed ; and all gradations are found 

 between this state and that close to the quartz, in which the 

 minutest crenulations of the latter are reproduced in the slate. 

 Another case is shown in pi. 11, fig. a, in which the vein is half 

 an inch thick on the south, decreasing to a mere film on the 

 north, the crenulations becoming smaller also in that direction. 

 A still better one was visible in 1901 at the 60-foot level of the 

 Kaulback belt, in the north tunnel, where the strata dip 60° S. 

 The vein in question is one of the belt of angulars, and at this 

 point cuts across the bedding for a few feet, then turns upward 



