68 STRATIGRAPHICAL GEOLOGY. 



South, at D. Evans's, the quartz forms such a prominent feature in the 

 gneiss that the rock has the appearance of being a conglomerate; the 

 dip is N. 15° W. 20°. At a saw-mill in the south-east corner of Milan, 

 common gneiss dips N. 70° E. 65°. East of this in Success, on the cart- 

 road to the meadows, and half a mile from the west line of the township, 

 there is a granitic rock, probably gneiss, the quartz of which is quite 

 friable. North on the Chickwalnepy the rock is a hornblende schist — 

 dip N. 30° E. 66°. On the Grand Trunk Railway, opposite Nay's pond, 

 there is a hornblende gneiss that contains epidote, in nodules, and veins 

 of calcite; the dip is N. 20° W. 50°. South, towards Milan water-station, 

 common gneiss dips N. 20°. At a saw-mill on Dead river, common 

 gneiss dips S. 30° E. 20°. North of Dead River pond there is a granitic 

 rock that contains a compact feldspathic rock. On Berlin heights a 

 pyritiferous schist dips N. 40° E. 6y°. At Berlin falls a hornblende 

 schist dips S. 45° E. 60°; and in a railway cut below the station there 

 are folds in the common gneiss, the strata being nearly vertical. There 

 is gneiss on Randolph mountain; and at Jefferson hill it dips N. 10° W. 

 18°. The same rock and nearly the same dip were observed within a 

 mile and a half of Lancaster village, on the road from Jefferson hill. On 

 the road south of Mt. Prospect the common gneiss dips N. 20° W. 18°. 

 South, near Blood pond, where it comes in contact with the harder Hu- 

 ronian rock, the dip is N. 10° W. 50°; and the strata are crumpled and 

 contorted. There is common gneiss on Bray's hill in Whitefield; and 

 in the east corner of Dalton the same rock dips N. 15° W. 18°. There 

 is a fine-grained gneiss west of Round pond, and it dips N. 42° W. 60°. 

 Southward, the common gneiss outcrops on Mann's hill in Littleton. 



Intrusive Rocks, Sienite, and Porphyrite. 



The most northern limit of the sienite in New Hampshire is in the 

 extreme southern part of Colebrook, near G. and M. Parsons's. It is 

 composed chiefly of feldspar and hornblende. The feldspar is of a light 

 flesh color, passing into a light gray. This largely predominates, the 

 hornblende being only a small proportion of the mass of the rock. A 

 few blocks have been quarried. It seems to be easily worked, and it 

 makes a beautiful stone. If polished it would no doubt be ornamental 

 for pillars, to which use some of the sienitcs and granites that contain 



