GEOLOGY OF THE WHITE MOUNTAIN DISTRICT. 10/ 



beneath the Bethlehem formation than as newer rocks, partly because the 

 Whiteficlcl branch is overlaid closely by the Berlin or Lake gneiss upon 

 both flanks, without any room for the first-named group. Moreover, the 

 south-west end at North Lisbon is flanked by newer rocks, which follow 

 around the point, although the dip is reversed upon the north-west side, 

 Helderberg strata apparently running under the Bethlehem gneiss. As 

 this is plainly an overturn at North Lisbon, it is probable that the mono- 

 clinal dip farther north may be explained in the same way. 



The most characteristic localities of the chloritic gneiss occur in Beth- 

 lehem, between Pierce's bridge and the Baptist church, or Nos. ^6 to %6 

 of Section IX. Round mountain appears to be one great ledge. Peaked 

 hill shows plenty of ledges high up, the lower portions being generally 

 covered by drift. In all the western part of Bethlehem the ledges occur 

 chiefly on the elevated points of the hills. No ledge has yet been dis- 

 covered upon the large Beech hill in the north-east part of the town. 

 Neither has any solid rock been found on the Ammonoosuc between the 

 Wing Road station and the falls just below the White Mountain house, 

 save a very obscure outcrop of Lake gneiss east of Mr. W. H. Bean's. 

 The large, loose blocks scattered over Bethlehem hill are mostly of this 

 rock, and will be noticed again, when speaking of a local glacier which 

 once overspread this part of the country. In Franconia every drift hill 

 is crowded with them. 



Between Bethlehem station or Pierce's bridge and Gale river there is 

 no direct pubHc road, although the elevation is not great, and the dis- 

 tance to be traversed is only two miles. The stages between the Profile 

 and Crawford houses use instead the circuitous and sometimes dangerous 

 road over Bethlehem hill. But in the absence of carriage-roads we have 

 traversed the area on foot, and find the ledges entirely concealed by 

 glacial drift. The same is essentially true of the area between the high- 

 est saw-mill on Gale river and the house of S. Bullock, at the end of a 

 road leading south from the east and west road, a mile and a half towards 

 the station from the Bethlehem post-office. A supposed ledge north of 

 Bullock's shows a strike of N. 48° E., while to the south is the end of a 

 large moraine pointing towards Mt. Washington. This road to Bullock's 

 is situated upon the top of coarse moraine-like materials, and lies near 

 their eastern edge. 



