GEOLOGICAL f 



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NORTHEAST COIGN OF WILLISTON HALL, AMHERST COLLEGE 

 Showing the Cambnan conglomeiate-gneiss from the Monson quarry, with traces of pebbles, and shear 

 zones darkened by excess of biotite. (The pebbles are much more distirct in the photograph than 

 in the reproduction, especially at the left.) 



