PEGMATITE, SILEXITE, AND APLITE OF NEW YORK 33 



Fol luted gra nite Silexite Earlier pecjmatitc 



Vog nge rpeqm a titc 



reet 



Figs, i, 2, and 3. — Sketches of portions of the ledges at the summit of Duncan 

 Mountain in the Lyon Mountain quadrangle showing the relations of silexite and 

 pegmatite to the foliated granite. 



