GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 383 



mica schists. Probably these four are continuations of the same bed, re- 

 peated by undulations of the strata. As the dip is essentially monoclinal, 

 the repeated occurrence of the same rock indicates overturns. On the 

 south side are nests and crystals of chlorite. The west side of Sunday 

 mountain furnishes admirable examples of contorted strata on a small 

 scale ; and I have obtained a large block of the stone showing them, for 

 the museum. If it were figured, the curves would be like those already 

 given, on Plate X, of the boulder from Bemis brook. The dip by the town 

 farm, on the north-west slope, is N. 40° W. On the line of section, just 

 west of the North Branch valley, the dip is not more than thirty degrees 

 in the same direction. At the grist-mill, at the north end of the "street," 

 we find argillo-mica schists, with staurolite in distinct crystals, in hori- 

 zontal disposition, and also inclined as high as 25° N. 50° W. At one 

 exposure there is a small, shallow synclinal. Cleavage planes, cutting 

 the strata and highly inclined, are also present, which is uncommon in 

 New Hampshire. A related example may be seen east of the cheese 

 factory, perhaps two miles east of the centre of the village. The first 

 ledge is of argillaceous schist, at the fork in the roads, apparently dipping 

 65° N. 45° W. A few rods east there seem to be stratified layers, dip- 

 ping 20° S. 15° E., while cleavage planes occur corresponding with the 

 supposed strata of the first ledge described. There are several other out- 

 crops similar to the first ; but no others, like the second case mentioned, 

 have been seen close at hand. 



The north-west dip is resumed at Orfordville and westward, but there 

 is a development, a hundred yards wide, of what is probably Huronian. 

 In the east part of the village is a bed of soapstone, in argillitic schists, 

 with mineral aspects different from that in the other localities described. 

 It is green, like chlorite. The excavation, when examined, Sept. 20, i "^^2, 

 proved to be about sixty feet long and twenty feet deep in one part. The 

 stone occurred in three places, and seemed to occupy three undulations 

 of the strata, with two small faults. The strike is N. 17° E., and the dip 

 is N. 73° W., all the layers being inverted. The course is towards Sun- 

 day mountain. Should this ancient rock occur beneath that eminence, 

 we can understand its origin, since the elevation of the floor must of ne- 

 cessity raise up the underlying schists above those of the neighborhood. 

 A narrow Huronian axis, just including the soapstone band and inclosed 



