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these rocks rapidly 

 become less crys- 

 talline as we ap- 

 proach the position 

 of these two great 

 planes of disturb- 

 ance. Close to 

 these planes brown 

 mica, of metamor- 

 phic origin, so 

 abundant farther 

 north, no longer 

 occurs, and the 

 only sign of alter- 

 ation in the grits 

 is the change in 

 the clastic micas. 

 Clearly if we could 

 proceed a little 

 farther in the 

 direction of this 

 decreasing crystal- 

 lization, even this 

 sign of alteration 

 would be lost. The 

 position, then, of 

 the great planes of 

 movement approxi- 

 mately coincides 

 with the last trace 

 of crystallization 

 in the Highland 

 rocks, which would 

 be the position of 

 least power of re- 

 sistance to power- 

 ful earth - stresses 

 coming from a 

 south-easterly di- 

 rection. Under the 

 influence of such 

 stresses the non- 

 crystalline part 

 of the Highland 

 Series has snapped 

 off from the crys- 

 talline and harder 

 portion, and the 

 latter has been 

 forced over the 



