MEMOIRS, *c. 



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I. On Cotemporaneous Veins. 



By Professor Jameson. 

 ( Read 2d March ] 8G8. J 



As it is of importance to be able to distin- 

 guish true from cotemporaneous 'veins, and also to 

 know the different cotemporaneous veins that oc- 

 cur in mountain-rocks, I shall now state to the 

 Society the characters by which these kinds of 

 veins are distinguished from each other, and al- 

 so the more striking instances of cotemporaneous 

 veins that occur in several of the great rock-for- 

 mations. 



i. True Veins are from a few inches to several 

 fathoms wide ; and from a few yards to several 

 hundred yards long. They traverse different stra- 

 ta, and are confined to single beds or strata, only 



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