GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 355 



on the Sand hill, south-east of the college, in the valley of Mink brook, 

 near J. Wright's, and near S. Tenney's on the road to Mill Village. The 

 following are the positions of the strata proceeding east from the Sand 

 hill along the line of Section VI: Top of hill, 32° N. 55° W.; spotted 

 gneiss, 33° N. 55° W. and 25° N. 40° W.; thick bedded, with large crys- 

 tals of flesh-colored feldspar, 58° S. 50° E. north-westerly, the last rock 

 holding small bits of epidote and tourmaline. These strata are nearly all 

 monoclinal, the exceptional case being a little east of the centre, and be- 

 ing evidently a relic of what once represented the position of the whole 

 eastern half, and what is still retained by the micaceous upper layer. In 

 other words, this is an example of an inverted anticlinal, not extending 

 sufficiently far to include the upper division, or else there is a fault at 

 the east border of the massive heavier member. Essentially a similar 

 inversion may be seen wherever the area is crossed to the south, as 

 along Mascomy river and the south part of Lebanon, In the latter local- 

 ity not only the gneiss and micaceous layers, but also the green, soft 

 Coos schists adjacent upon both sides, all dip westerly and not at a 

 very high angle. These facts show the thoroughness of the overturn. 



There is a band of gneiss of superior character for quarrying, the coun- 

 terpart of that on Corey hill, extending southerly from near S. Tenney's 

 in Hanover, through the high hill south to the west part of the village of 

 Lebanon. The white ledges east of the school-house, near Freeman's 

 quarry, seem to belong to this layer. It is quarried extensively at Free- 

 man's and Walling's openings, on the road from Hanover to Lebanon. 

 The quarries are arranged in two lines, on the two sides of the anticlinal. 

 Near the scythe factory are huge blocks of sienite, which are probably in 

 place near at hand, and may follow the river into the village. Between 

 J. Ela's and F, Peabody's the gneiss dips north-west. Other facts about 

 these rocks may be seen upon the small sections crossing them, pre- 

 sented in Figs. 55-58. The whole series of rocks near the Connecticut 

 river is repeated in Moose mountain. (See delineation of Section VI.) 



3. HURONIAN. 



These rocks extend the entire length of the tract under description; 

 and we may trace the three divisions of them mentioned in the preceding 

 sketch, viz., Lisbon, Lyman, and Swift Water groups. The first is the 



