SOUTH WESTERN NOVA SCOTIA. POWERS. 295 



small garnets. Certain harder places in the surface of the 

 rock stand up as small rectangular pinnacles one inch in diam- 

 eter and three to four inches high, undercut below the hard 

 capping which is only one quarter of an inch thick. The top 

 of these caps are remnants of the smooth surface left by the 

 ice. Such deep post-Glacial erosion is favored in this locality 

 by the soft nature of the sericitic ground mass of the schist. 

 The strike of these rocks averages N 25 E with a dip of 75 S. 



A half mile east of Sand Point the schist is replaced by 

 quartzite of light grey color and fine grain in which are oc- 

 casional quadrangular biotite crystals about* one quarter of 

 .an inch on a side (perhaps secondary after hornblende), 

 staurolite crystals one half inch long, and occasional pink 

 andalusites one inch long. The dip o the beds changes from 

 70-85 S to vertical. 



For a mile to the south much of the quartzite does not 

 show large metacrysts*, though small biotites still persist. 

 At one locality a mile and a half south of Sand Point, staurolite- 

 biotite quartzite reappears. The staurolites are of usual size, 

 but few in number. The biotite metacrysts are about one- 

 sixteenth of an inch in length. Under the microscope the 

 rock shows a fine ground-mass of quartz and sericite, meta- 

 crystals of biotite free from quartz inclusions, a few garnet 

 crystals, and accessory chlorite ; apatite and iron ore. The 

 sericite is more abundant near the biotite than elsewhere. 

 The strike of these rocks is N 15 E, the dip 75 N. 



From the outcrop just described to the end of Eastern 

 Point, the rock is everywhere a dense grey quartzite free 

 from metacrysts. Interbedded in the quartzite are a few 

 bands of mica schist one to three feet wide. The structure 

 here is anticlinal, the dip of the bedding being vertical near 

 the "Tea Chest", a mile and a quarter north of Eastern Point 

 with a dip of about 75 N on the north, as above stated, and 



*A term introduced by Lane to designate the phenocrysts of metamorphic rocks which are 

 formed after the groundmass. See the Bull. Geol. SOP. Amer. Vol. 14, 1903, p. 369. 



