602 STRATIGRAPHICAL GEOLOGY. 



pond, in Tamworth, Dr. Jackson visited an excavation for lead mining in 

 a "solid vein of reticulated and compact jaspery quartz rock." This sug- 

 gests the possible existence of one of the Hillsborough county bands of 

 quartz. Two miles north of "Atkinson's tavern" Jackson found an inter- 

 esting assemblage of igneous rocks. They were dykes of a "singular por- 

 phyry, having a greenish, compact feldspar base. The porphyry dykes 

 cut through a hill of granite composed of a pure white feldspar, quartz, 

 and bright transparent mica. Porphyritic granite also abounds in the 

 vicinity. These dykes, from ten to sixteen and a half feet wide, traverse 

 this rock, and run in a N. 70° E. direction. One of the dykes contains 

 carbonate of lime in sufficient quantity to produce rapid effervescence 

 with acids. It contains, also, crystals of hornblende, epidote, and feld- 

 spar." Iron and copper pyrites in small amount occur in one of these 

 dykes. At Freedom village I found large boulders of a peculiar sienite, 

 which has not yet been seen in place. In the east part of the town are 

 occasional eruptive masses of a porphyritic granite like that composing 

 the bulk of Green mountain in Effingham. Near the Maine line the dip 

 is 15° S. 80° E. At the north end of Ossipee pond the dip is 45° W. 



TJie Southern Area. This seems to be a belt two or three miles wide 

 surrounding the eruptive granites of Moose, Cropple Crown, and other 

 mountains on the borders of Carroll and Strafford counties. In the east 

 part of Wakefield there is an anticlinal, with the ridge near T. Chapman's, 

 where the rock is a micaceous gneiss, with coarse granitic beds, and the 

 dip is 15° S. E. At the outlet of Newichwannock pond the dip is 25° in 

 the same direction. The rock is cut by trap dykes carrying calcite, dip- 

 ping north-west, also by large granite veins. The opposite dip appears 

 on Brackett's brook, a tributary of Lovewell's pond. Here is a quartz 

 band, also, adjacent to gneiss, inclined 75° N. 70° W.; and another half a 

 mile north. On top of the hill south, near J. Copp's and the town line, 

 ferruginous and mica schists, dipping 25°-30° S., are cut at right angles 

 by granite veins several rods wide. Similar rocks at N. Kimball's, a mile 

 east of the Branch river, have a strike east of north. Between the Junc- 

 tion and "corner" the schists dip 50° N. 10° E., with granitic layers. At 

 Union Village, typical Montalban schists and granite dip 12° N. 40° W. 

 Nearly three miles to the north, by E. P. Oilman's, hard granitic beds 

 dip 80° W. 



