Plate 6 



Upper hgure. Lenticle of amphibolite in garnet gneiss, about 15 feet 

 Looking in direction of pitch of sigmoid, northwest. Typical of the 

 relations between the garnet gneiss and amphibolite, the latter being 

 preted as a broken sill. 



Eastern flexure of sigmoid, 2.1 miles south of Pierrepont, top of hil 



Low^er figure. Pegmatite cutting amphibolite-garnet gneiss injection 

 In the middle right-hand part of the picture a band of amphibolite 

 2 inches thick is bevelled by a bifurcating dike. This is typical of the 

 of occurrence of pegmatite " flammen " throughout the garnet gneiss 

 of the sigmoid area. Scale, one-eighth natural size. 



About 1.5 miles east of Beach Plains Church. 



long, 

 usual 

 inter- 



rock. 



about 



mode 



zone 



