no STRATIGRAPIIICAL GEOLOGY. 



feldspar, and shows more than the average amount of quartz. Near the 

 top of the hill, near the town line, there is a mass of soft chloritic schist 

 ten feet thick imbedded in the gneiss. On the very top of the hill there 

 are many micaceous seams interstratified with the ordinary rock. This 

 is the area where a local anticlinal exists. 



In the White Mountain collection this formation is represented by 

 Nos. 41 to 54, and 176 and 177, from the height of land in the road 

 between the White Mountain house and Jefferson. By the study of 

 these, in connection with those specified in the Ammonoosuc collection, 

 the Coos and Essex district, and along the route of Section IX, and 

 comparing the locations upon the maps with their dips, one can learn 

 all that it is possible now to present upon the subject. 



Topographically, this northern terrane of Bethlehem gneiss is one 

 continuous central ridge, normally the most elevated along the central 

 median line. A ridge commences at the union of the "South Branch" 

 with the Ammonoosuc at North Lisbon. From 66"] feet at the railroad it 

 rises immediately to 1000 feet in the hill west of Streeter pond. Falling 

 off a few feet, it attains to 1329 feet on the height of land in the stage- 

 road between Franconia and Littleton ; then it rises to form four summits 

 in Bethlehem of 1600, 1600, 1905, and 2042 feet, the last being Peaked 

 hill. Next in our eastward course we find the valley of the Ammonoosuc, 

 1200 feet, which, on account of long-continued atmospheric grinding and 

 gouging, has excavated a notch through the ridge. On the east is Beech 

 hill, 1800 feet, a gap of 1475 back of the Twin Mountain house, and 

 then the final rise to 3670 feet in Cherry mountain. The excavation of 

 Israel's river in Jefferson, beyond Cherry, where the range is very nar- 

 row, brings the level down to 1250 feet before we finally lose the forma- 

 tion near the Pond of Safety at 2000 feet. The Bethlehem ridge is quite a 

 conspicuous one, when viewed either from Mt. Cherry or Mt. Washington ; 

 and the wide valleys of Franconia and Israel's river are subordinate to 

 the main line of elevation. The Whitefield spur is also quite elevated, 

 rising considerably above the 1500-feet contour line in the south part of 

 the town, while the looo-feet level scarcely touches it south of the vil- 

 lage, and none of the area in Jefferson goes below 1200 feet. 



Fig. 1 1 will show the relations of the Bethlehem and Lake groups of 

 gneiss between Dalton and Carroll. We present the dips of the strata 



