Plate 13 



Upper figure. Mixed rock; typical example of modification of amphibo- 

 lite by granite. Admixture here is extreme and not common. About one- 

 eighth natural size. 



Same location as shown in plate 11, lower figure; 1.3 miles southwest of 

 Pierrepont. 



Lower figure. Typical black amphibolite or hornblende gneiss ; seamed 

 with minute veinlets of hornblende (weathering in relief), the whole then 

 cut by irregular masses of pegmatite. Scale about one-tenth natural size. 



One and four-tenths miles east-northeast of Beach Plains Church, about 

 75 yards east of road. 



