66 GEOLOGY OF MOOSE RIVER GOLD DISTRICT — WOODMAN. 



Cremilations : cross veins. — Cross veins are in some cases 

 corrugated, but not so frequently as the stratified leads. These 

 curves have no relation to folds in the country rock, except in 

 angulars parallel to the strike but not the dip of the sediments. 

 They are more likely to be uneven in size and irregular in 

 amplitude and interval ; and rarely become progressively smaller 

 with a thinning of the vein (pi. 11, fig. d). They are exposed 

 particularly well in the new openings of the Kaulback belt, in 

 the quarry on areas 73 and 74, and in that on areas 76 and 77. 



Where the veins have a strike perpendicular or parallel to 

 that of the cleavage, it might be expected that slipping along 

 those planes, or the corrugation of the sediments close enough 

 to give strain-slip cleavage, would account for the phenomenon. 

 Instances of veins partillel with the strike of the cleavage (which 

 is close to that of the strata except where folds plunge), but 

 cutting the sediments in their dip, are confined to certain angu- 

 lars. Those veins which run perpendicular to the strike of the 

 cleavage must have two accompanying features, to be explicable 

 by the method just mentioned. If they have slipped along 

 ordinary cleavage planes, the strata enclosing them must also 

 have slipped ; but I have never found this to be the case, where 

 such veins have been visible. Furthermore, where the strata 

 are serrated, the serrations are small as compared with the 

 corrugations in veins, and fairly uniform, with no irregularity 

 comparable to that shown by the cross veins. If strain-slip 

 cleavage caused the corrugations, we should find some sign of it 

 also in the sediments, either cleavage or acute small-scale fold- 

 ing ; but do not. The best cases in the veins occur where there 

 are no corrugations in the strata, and where the major planes of 

 division between the beds, which must be made uneven if 

 slipping has taken place along any cleavage, are perfectly even 

 in their dip. There is not the slightest deviation in the dip of 

 the laminse in proximity to the veins. 



The more numerous instances of veins oblique to the strike 

 of cleavage and stratification cannot be explained by any theory 



