62 STRATIGRAPHICAL GEOLOGY, 



formly N. 30° W. 60°. These rocks extend southward, and outcrop in 

 Dummer opposite T. Wentworth's, where they have a chloritic aspect; 

 also on the north Hne of Dummer, on the "tote "-road to Millsfield pond, 

 they are somewhat argillaceous. South-west of Dummer ponds there is 

 an extensive outcrop of gray siliceous schist, and it is quite probable that 

 the rock is continuous from west of the Androscoggin on the line of 

 Cambridge and Errol. Two miles north-east of Leighton's mill the dip 

 is N. 40° W. 70°. A mile and a quarter north-east the dip is S. 80° E. 

 80° Near G. Grapes's the dip is S. 50° E. 72°. 



Stark and Milan. 



At saw-mill near the mouth of Phillips brook there is a gray siliceous 

 schist, with vertical strata. At Stark water-station the rock approaches 

 novaculite, and dips S. 30° E. 72°. On the road opposite the mouth of 

 Phillips brook the siliceous schist dips S. 50° E. 70°. On the hill north 

 of Long pond the same rock dips S. 70° E. y6°. At West Milan the 

 siliceous schist has hornblende schist interstratified with it; the dip is 

 N. 50° W. 75°. In the railway cut, a mile and a half south-west of the 

 village, the siliceous schist dips N. 80° W. 80°. The rock here in places 

 is pyritiferous, and some bands contain hornblende. At Higgins's saw- 

 mill the siliceous schist dips N. 70° W. 75°. 



Columbia and Stratford. 



On the high land a mile and a half from the Connecticut, on a tract of 

 land formerly owned by Dr. Lombard, three fourths of a mile from the 

 house, in the Notch towards Sims stream, the rock is a dark siliceous 

 schist, that dips W. 80°. At William Gilkey's, mica schist dips N. 50° 

 E. 65°. The rocks of Lyman brook will be described in the sketch of 

 Section XII. A mile and a half north-east of Mrs. S. Day's a dark sili- 

 ceous schist dips W. 70°. At North Stratford the mica schist stands in 

 high ledges; one dip was found to be N. 58° E. 85°. But generally in 

 the vicinity of North Stratford the dip is exceedingly variable. Near 

 the mouth of Bissell brook the same rock as at North Stratford dips 

 N. 70° W. 80°. A mile south-east of M. D. Johnson's, and a thousand 

 feet above his house, a hard, dark siliceous schist comes in contact with 

 granite. This siliceous schist, going towards Johnson's house, has a 



