478 STRATIGRAPHICAL GEOLOGY. 



north, near A. Whitcher's, the rock is fine-grained, and the stratification 

 is remarkably distinct, A mile and a quarter north, on a road west, near 

 J. Whitcher's, is a thick-bedded, very light-colored gneiss ; and south, 

 near N. Libby's, there is hornblende gneiss. West of the railroad, 

 beginning at Webster Slide mountain and extending west to the Cross 

 iron-ore mine in Piermont, and south-west to Ore hill, the rock is a 

 fine-grained gneiss, sometimes forming a transition state into mica 

 schist, — and everywhere it is more or less ferruginous. A band of this 

 rock extends southward into Wentworth. Gneiss is found between Ore 

 hill and Tarleton pond, and there is an outcrop near J. H. Kelley's ; that 

 on the road west of Ore hill may be more allied to the Bethlehem than 

 the common gneiss. At Warren village we find common gneiss ; and on 

 Hurricane brook there is the same coarse variety as at the saw-mills on 

 Baker's river. The fine-grained gneiss and quartzite west are the min- 

 eral-bearing rocks of this section of the state. 



In Wentworth a very large proportion of the rocks is common gneiss ; 

 but we have besides a fibrolite schist on the ridge of Mt. Carr, which 

 crosses the north-east corner of the town; a mica schist, which runs to 

 the north from near N. Coolidge's and outcrops at the outlet of Lower 

 Baker pond ; and west of the mica schist, at T. Simpson's, we have the 

 Bethlehem gneiss. The last two disappear a mile and a half south of 

 Simpson's; and the common gneiss extends entirely across the south 

 part of the town. On the south-east, it extends beyond the border of 

 Wentworth into Rumney. A fine-grained gneiss outcrops at E. Cur- 

 rier's ; and west of this we have fibrolite schists. On the west, the com- 

 mon gneiss extends into Orford a fourth of a mile west of E. Lamprey's. 



In Dorchester the prevailing rock is also common gneiss. Its western 

 boundary runs from near E. Lamprey's in Orford to a point just west of 

 McCutchins pond, thence to Norris pond and to the west of its outlet, 

 and thence it probably runs to the south line of Dorchester, near Clark's 

 pond. In the north-west corner of the town it has on the west quartzite 

 and the chloritic hornblende schists of Smart's mountain; at J. Clough's, 

 a hornblende rock and a fine-grained gneiss or mica schist ; and south of 

 the outlet of Norris pond, the friable, brittle rock that resembles pro- 

 togenc gneiss. On the cast we have only the fibrolite schist. It runs 

 along in the edge of Groton, crosses over into Dorchester a mile north 



