GEOLOGY OF TFE CONNECTICUT VALLEY DISTRICT. 439 



Higher up are beds of micaceous quartzite, not very abundant, dipping 

 N. 60° E. These are followed by grayish-green hornblende rock, partly 

 actinolitic. A breccia was also noted between masses of hornblende. 

 The several bands following are these, in order : quartzose gneiss, horn- 

 blende, quartzose gneiss, hornblende, mica schist, dipping 40° S. 50° E., 

 of considerable thickness ; hornblende schist, at the height of land, argil- 

 laceous and staurolitic schists, dipping 50° S. 58° E., and 45° S. 72° E. 

 This brings us to No. 157, an indurated schist, where the first road west 

 of South Vernon crosses the line. The relative thicknesses of these 

 several beds may be ascertained by referring to the published figure. 



The eastern ends of these two sections are a mile apart, but they come 

 together at No. 157. Hence we may learn how the breadth agrees upon 

 the lines so near together ; and it is surprising to learn that the predomi- 

 nating rock along the state line is but slightly represented upon the other, 

 but the dips are everywhere the same. Two narrow bands of hornblende 

 rock are cut on the southern line, both of them combined hardly five 

 hundred feet wide ; on the other, at least one third part of the strata con- 

 sists of this material. The western bands seem to correspond with each 

 other, while we may say the eastern has narrowed extremely in proceed- 

 ing southerly, or else it is covered by quartzite and mica schists. The 

 latter is probably the better view, since the hornblende expands very 

 much to the south in Northfield and Gill. 



Following our section along the state line, we find next a considerable 

 breadth of staurolite mica schist, thicker-bedded and more uneven from 

 contortion than a similar rock in Bernardston (No. 158). On the small 

 hill west of the road crossing the state Kne, the dip is 45° easterly (No. 

 160). In the deeper valley beyond, not traversed by a public road, the 

 dip is north-east (No. 161). This valley marks the place of an anticlinal, 

 the rock on the west side, and up to the summit of the steep hill-side 

 (No. 162), dipping 65° S. 20° W. This whole hill, known as Pond moun- 

 tain, consists of the same staurolite rock. The crystals are very small, 

 and in other respects differ from any found elsewhere in this Helderberg 

 area. 



The rock for the three quarters of a mile succeeding has not been 

 examined. That next seen is at the crossing of the Bernardston road 

 over clay slate, where we have, first, by continuing the strike a short 



