GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 315 



mile north of the Hne V, as exhibited upon Fig. 31. On the north side 

 of the outlet of Young's pond the slates dip 78° S. 32° E. At the town 

 line below, the dip is 60° N. 52° W. North of the pond, on the south 

 flank of Mormon hill, the dip is usually high north-westerly. As before 

 stated, the west boundary of the slates is roughly serrated. Near the top 

 of the hill, adjacent to the curious conglomerate, are ledges of slate, hold- 

 ing veins of quartz eight feet wide, cutting across the stratification. The 

 dip is N. 47° W. This seems to be the end of the clay slates proper in 

 this direction. There is slate by the saw-mill on Mill brook, below 

 Young's pond, also at S. Wetherby's, on the hill west, both with the 

 usual dip noted farther south-west. On the west side of Perch pond the 

 dip is 70° N. 32° W. On top of Bald hill the same slates dip 40°-6o° 

 N. 42° W. Beyond this they occur at Ela's, where there has been a 

 quarry, the last house in Lisbon on the Blueberry Hill road. The whole 

 of the Blueberry Mountain slates, with their argillaceous schists and 

 sandstones, seem now, after further study, to belong to the Cambrian 

 group and not the Helderberg, contrary to the delineation of the map 

 (Fig. 27) and published papers. For convenience, we will describe them 

 further on in connection with the several sections crossing the Helder- 

 berg strata. 



We have very little to say concerning the considerable development of 

 clay slate from Parker hill to Partridge pond. The dip in the south-west 

 part is thought to be south-easterly. There are irregularities in it two 

 miles before reaching the north line of Lyman, on the road to West Lit- 

 tleton. South from Partridge pond the slates stand nearly vertical, with 

 a north-east strike. There is a narrow band of clay slate dipping south of 

 east, conforming with the Lisbon schist at the east base of Gardner 

 mountain. We have notes of it, also, at E. C. Stevens's, a mile north, 

 and in West Littleton at the north base of Gardner mountain. It is 

 rather more micaceous and ferruginous than is common in the larger 

 areas. It points towards the tapering end of the Lyman group across 

 the Connecticut river in Vermont. There are two or three very small 

 patches of slate in the north-west part of Littleton. One of them has a 

 quarry in it, at R. Smith's. 



