Plate 15 



Upper figure. Quartz-orthoclase pegmatite dike cutting garnet gneiss and 

 inclosing scattered garnets which have segregated to form individuals of 

 larger size. Many stages in this process are shown. Scale, about one-fourth 

 natural size ; looks northwest. 



One and five-tenths miles south-southwest of Pierrepont, west of road. 



Lower figure. Eutectic intergrowth of quartz and fourmaline in pegmatite 

 dike. View looks down on horizontal surface; scale shown by centimeter and 

 millimeter divisions on rule. 



About six-tenths of a mile north-northwest of North Russell. 



