374 STRATIGRAPIIICAL GEOLOGY, 



their directions seem to correspond, save that the first quartzite seen in 

 our ascent dips to the south, overlying mica schist and gneiss. If, how- 

 ever, there were an upthrow of the mountain, the facts would be con- 

 sistent with a former union of the two. 



The Western Range. Quite recently the facts establishing the exist- 

 ence of a narrow but persistent range of quartzite in the west part of 

 Orford, Lyme, Hanover, and Lebanon have been observed. It seems to 

 follow the western border of the Hanover-Lebanon area of Bethlehem 

 gneiss. Commencing in the south part of Lebanon, we find large blocks, 

 and, I believe, ledges of a conglomeratic quartz, east of A. Hall's and sons. 

 They occupy a hill-top, extending nearly a mile northerly past the two 

 Stearns houses. This layer cannot be large. Upon Craft's hill a stra- 

 tum of it, perhaps three feet thick, may be seen in two places. There is 

 another outcrop of quartzite on the south side of the top of Colburn hill, 

 and there are some appearances of it on the long north slope towards 

 Hanover plain. In the valley of Mink brook, and through much of Han- 

 over, this rock is concealed. Back of C. Houston's, there is an outcrop 

 conspicuous for a long distance. We begin to find many ledges of this 

 rock on a large brook opposite Pompanoosuc. Near F. Merrill's it is a 

 sandstone, dipping 40° N. 48° W. It may be followed for a mile along 

 the hill road to Lyme with certainty, cropping out in several places. 

 In Lyme, in the bend of Fairfield brook, it appears again, also at Lyme 

 church ; and the hill west shows a white rock like it, but it has not been 

 visited. It is equally plain to the east of the road to Post pond. It is 

 unusually thick at the fork of the road north-east of Post pond, dipping 

 north-westerly. High up the west side of Acorn hill, as you take the 

 north-east road from Post pond, the same rock appears. At J. Hall's 

 the quartzite dips 75° N. 50° W. There is a mass of quartzite, on the 

 south-west side of Indian pond in the north part of Orford, eight miles 

 distant, which may belong to the same band ; for that traced northerly 

 from Lebanon skirts the west line of the Bethlehem gneiss, and this in 

 Orford occupies the same stratigraphical horizon. Future search may de- 

 tect occasional ledges of quartzite through Orford, connecting the two 

 remote points. It is worthy of note, however, that the quartzite immedi- 

 ately adjacent to the gneiss is much more limited than that connecting the 

 two Bethlehem areas together, from Merrill's in Hanover to Hall's in the 



