coos AND ESSEX DISTRICT. 6l 



MiLLSFIELD, WeNTWORTII's LOCATION, AND EllROL. 



Between J. C. Sweet's and stream north there is quite an extensive 

 outcrop of chloritic schist. At the falls the rock is mica schist, but it 

 has been largely replaced by a coarse, intrusive granite. Near L. Lover- 

 ing's there is a pyritiferous schist dipping E. 74°. Near S. Rice's, on 

 the western border of Errol, a coarse, intrusive granite has replaced the 

 schist. Between Corser brook and Wentworth pond, in Wentworth's Lo- 

 cation, mica schist, with garnets, dips N. 70° W. 85°; half a mile north- 

 west of the pond mica schist dips S. 30° W. 65°; then a granitic gneiss. 

 East of Aker's pond the strike of the mica schist is N. 30° E., and the 

 strata are vertical. The schist here is full of very small garnets. The 

 rocks immediately south of Clear stream and the Androscoggin will be 

 described on Section XIL On the north border of Wentworth's Loca- 

 tion the rock is a mica schist, containing small crystals of staurolite, and 

 dips N. 82° W. 65°. At the base of the Dustin mountain, on the south- 

 east, the rock is a gneissic mica schist and a coarse granite. In Errol, 

 south of the section, in the road from Bragg's bay to Upton, Me., the 

 rock to the height of land is a mica schist ; and on the ridge between 

 the height of land in the road and the lake the strata are very much 

 contorted, and, where the rock presents a smooth surface, the bendings 

 of the strata occur on every possible scale. The general dip is S. 60° E., 

 nearly vertical. South, near the town line, there is hornblende schist, 

 with a south-easterly dip. In Millsfield, on the section east of Millsfield 

 ponds, an argillaceous schist was seen. This may be an extension south- 

 east of the gray siliceous schist of Dixville notch. Near the height of 

 land south, in Millsfield, there is a hornblende schist that dips S. 80° E. 

 58°. South-west of Rocky pond, the most southern of the Millsfield 

 ponds, there is a dark siliceous schist dipping S. 65° E. 58°. A mile and 

 a half south-west this schist passes into a hard, dark, almost black sili- 

 ceous slate, which in places contains many veins of white quartz. Just 

 north of Newell brook there is a band of hornblende schist. 



CaAIBRIDGE AND DUMMER. 



On the line of Cambridge and Errol, from the Androscoggin and the 

 Molnichewock, the rock is a gray siliceous schist ; the dip is quite uni- 



