BERNARDSTON SERIES OF UPPER DEVONIAN, 271 



p. 292.) Macroscopically the upper schist is somewhat thicker bedded and 

 of more uueven surface. A lens is hardly needed to see the muscovite 

 scales on the surface of the slabs, and the biotite and garnet are conspicu- 

 ous and abundant accessories, instead of being only minute and, in the case 

 of garnet, rare. 



The syncUne north of the brook in the Williams pasture. — (See north part 

 of map, fig. 15, p. 263.) Within the area just described the rocks dip mostly 

 to the east, while north of the brook the structure is decidedly different. A 

 section east and west through the woods shows a great syncline of the 

 quartzite in the argillite. 



Following down the brook from the limestone to where the woods 

 end, and then skirting the latter for a few rods north to where the first 

 wood road enters them, a little way in and at the first outcrop on the 

 south side of the road one comes upon a well-exposed contact of the argil- 

 lite beneath and the quartzite above; strike N. 20° E., dip 20° W.; the 

 argillite flat-fissile, with few chloritized garnets; the quartzite a dark-gray 

 indurated sandstone, becoming coarser higher up. The two beds seem to 

 be plainly conformable. The argillite can be followed north to a point in 

 the bluff opposite C. Frary's house, and has a uniform westerly dip beneath 

 the quartzite, and on the west of the latter the argillite is found dipping- 

 easterly beneath it, though the junction is covered. I imagine this syncline 

 is cut off on the north by a fault along the bed of Fall River, but the rocks 

 are covered here. Directly opposite the limestone across the brook to 

 the north the qua,rtzite contains dodecahedi'al garnets one-half inch across, 

 bordered by chlorite. 



The outcrop along Fox Brook south of the Williams section. — On the 

 road over West Mountain, behind the first house after leaving the village, 

 there is seen from the road a bare bluff of blue till, and below this is an 

 outcrop in the brook of Triassic sandstone. Twenty rods above this the 

 quartzite rests conformably upon the argillite, which contains a few gar- 

 nets just below the junction. It strikes N. 60° E., and dips 20° E., and the 

 boundary is thus pushed east by the whole width of the Williams section, 

 though the fault which separates them can not be exactly located. 



