GEOLOGY OF THE LAKE DISTRICT. 603 



Tumble-Down-Dick and Mt. Delight, in the west part of Brookficld, 

 show the Montalban schists well, dipping 50° N. 85° W., and 85° W. near 

 R. H. Piper's. The range crops out to the north-east on the Wolfebor- 

 ough line, dipping 45° N. 80° W.; also at D. F. Stoddard's the mica 

 schists dip 14° N. 85° W. At J. Goodhue's, Brookfield, is an irregular 

 granitoid rock, with trap. On the north side of Cotton Valley station 

 are ferruginous schists, inclined 50° W., about one fourth of a mile wide. 

 At the northern base of the granite mountains, in Brookfield, ledges are 

 scarce ; but there are mica schists at G. W. Chamberlain's. These facts 

 show the development of the Montalban rocks between the granite range 

 and the usual Lake gneisses near the Wolfeborough line, and a decided 

 anticlinal in the east part of Wakefield. The variations in the angle of 

 the dips in Wakefield suggest the presence of a synclinal. 



Along the line of Section V there seems to be a synclinal in Middle- 

 ton, — there being a dip of N. 20° W. near J. B. Stevens's and at Mrs. 

 Gibbs's. The easterly dip appears at a "mine" a mile west of the road. 

 The veins there are of coarse granite, containing the minerals mispickel, 

 tourmaline, mica, and feldspar crystals. An anticlinal follows, as there is 

 a south-west dip of mica schist and granite in the east part of New Dur- 

 ham, where the road crosses the Cocheco river. The change to a north- 

 erly dip is seen at a mill at New Durham corner and at G. D. Savage's, a 

 little north, 80° N. 5° E. On the north side of March's pond the mica 

 schist is full of granite in its crevices. The dip changes from other east- 

 erly observations to N. 30° W., and back to N. 10° E., before coming to 

 Merrymeeting lake. After passing the granite, dips somewhat northerly 

 prevail through Alton to the lake. The rock on this route is therefore 

 full of subordinate undulations. Towards Gilman's pond in Alton the dip 

 is 45° N. E. There are sienitic beds a short distance west of Alton bay. 



Eruptive Rocks. 



These are finely displayed in the Lake district. Perhaps the southward 

 extension of the Chocorua group into Tamworth has been already suffi- 

 ciently mentioned in Chapter III. There is also a large ledge of Albany 

 granite in the south-east corner of Thornton. Besides that, there are four 

 important eruptive areas: (i) of the Ossipee mountains; (2) Moose moun- 

 tain, etc. ; (3) Red hill and Gunstock ; (4) Green mountain. No two of 



