Phenomena of Granite Veins. 



491 



(30) Granite Veins in Gneiss; Palmer's Island; N. Bedford Harbor. 



In No. 31, a vein of granite about six inches wide, is intersected 

 by another a foot wide. The strata of gneiss on one side of the 

 last mentioned vein have also been moved laterally about four inch- 

 es ; so that the seams do not correspond on opposite sides. I am 

 inclined to believe that it is an error in the sketch, that it does not 

 show a similar slide in the vein that has been intersected : though I 

 have no rcccollection on the subject. The basset edges of the strata 

 are here represented. 



(31) Granite Veins in Gneiss ; Fair Haven. 



No. 32 is a nearly perpendicular section, running nearly north and 

 south across the strata of gneiss, and showing an irregular branch- 

 ing vein. The principal vein is two feet wide, the branch about one 



