GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 375 



north part of Lyme. The Moose Mountain and other ranges border the 

 Bethlehem gneiss as well as the longer range near the Connecticut river. 

 Both areas lie upon the west flanks of the gneiss, and none occur upon 

 the eastern. Both occur in staurolite mica schists, while the western 

 comes very close to hornblende rock all the way, though probably not 

 connected with it. These ranges are undoubtedly of the same age, and 

 originally constituted beaches upon the shores of Bethlehem islands. 



Moose Moiintain Range. The gap between Bear hill, Lyme, which is 

 the southern end of a quartzite area, and Moose mountain, Hanover, is 

 one thousand feet above the sea. The valley is covered by drift, and 

 might conceal this rock, save that the south end of Bear hill is so com- 

 pletely occupied by other rocks that there is no place for it. Moose 

 mountain rises very rapidly 1300 feet above the valley; and it is easy to 

 see, from the hills north, the gradual thickening of the white quartzite 

 from below upwards. This range, as conspicuous as Cuba, Piermont, and 

 other similar mountains to the north, owes its existence, like the others 

 named, to the presence of quartzite. On the road over this mountain 

 the quartzite dips 50° N. W. Nearly three miles farther south the dip 

 is 72° W., and it is somewhat interstratified with mica schist. Less than 

 a mile farther, the observed dip is 80° W., and the rock occupies the very 

 crest of the mountain. The course, which has been south, now changes 

 to a few degrees east of south. Almost at the south-east corner of the 

 town, it doubles back westerly so as to run S. 33° W., and abruptly dis- 

 appears beneath the slates as if it were broken off, while its thickness is 

 not great. A considerable search in the neighborhood, in East Lebanon 

 and the north-west part of Enfield, fails to find any trace of the continua- 

 tion of this particular type of quartzite. The boundary between the slates 

 and gneiss has been carefully examined ; and nothing is met with north 

 of Lily ponds, where it is largely developed, and probably dips westerly. 

 It lies in the proper stratigraphical position, between the slates and the 

 gneiss ; and it is likely that the material is wanting in the Mascomy val- 

 ley, just as it was along Fairfield brook in Lyme, at the north end of the 

 range. I have never explored Mt. Tug — 1700 feet — (980 above the lake), 

 which is in a direct line between the last exposure seen upon Moose 

 mountain and another locality about to be mentioned. The rocks have 

 a south-westerly strike, as if the two quartzites might be continuous. 



