352 STRATIGRAPHICAL GEOLOGY. 



eight miles. In my second annual report I ranked this layer with the 

 Coos group, as well as the band of Bethlehem gneiss accompanying it to 

 the west. That reference is an error. The gneiss here is obviously the 

 rising up of an older formation in the midst of slaty rocks, separating the 

 mica schists from the quartzite believed to be of the same series, since 

 they are not separated from each other farther south. 



West of Post pond in Lyme this gneiss crops out, dipping N. 52° W. 

 To the south, along Grant brook, the outcrops constitute massive bosses, 

 rounded by ice, in which I find it difficult to identify the planes of depo- 

 sition. I suppose they must agree essentially with the inclination of 

 the slates to the west, and the limestones to the east. At A. B. Dim- 

 ick's, near the western border, I have an observation of a dip in it of 25° 

 N. 50° W. By I. P. Stark's the dip is 30° N. 17° W. Hornblendic and 

 epidotic varieties occur half a mile south of Stark's, on another road, dip- 

 ping 15° N. 28° E. This is probably a local irregularity in the position. 

 Near J. P. Dimick's, at the north foot of Bear hill, the recorded observa- 

 tion indicates the position of 20° N. 24° W. Along the Canaan road, 

 between Bear and Holt's hills, are fine exposures of gneiss. Bear hill 

 rises precipitously on the west for two or three hundred feet. It is prob- 

 ably composed of gneiss at the base and quartzite at the summit, both 

 with a very low north-westerly inclination. There should be further de- 

 tails of the position and character of these rocks in the south-east part 

 of Lyme, in the following chapter. The south end of Bear hill is precipi- 

 tous ; and the gneiss terminates as abruptly as the hill. 



The dip of this gneissic area seems to be essentially monoclinal, with 

 slight indications of a synclinal under Mt. Cuba, and at the east base of 

 Davison hill. The structure will probably prove to be like that of the 

 Hanover area, which has been examined with greater care. Some fur- 

 ther light as to its relations to the adjoining rocks will be gained by re- 

 ferring to the several sections crossing the rocks in Orford and Lyme 

 (Figs. 50-54)- 



The Hanover-Lebanoii Area. This extends from the north part of 

 Hanover to the south part of Lebanon, about ten miles long and three 

 miles wide at its maximum. The north end is narrow, commencing in 

 Woodward's and Spencer hills, rising into Lord's and Prospect or Pinnco 

 hills, which are the culmination of the range as respects height ; it con- 



