290 STRATIGRAPHICAL GEOLOGY. 



the later series as in Fig. 31, and also crosses the mountain, extending 

 from Young's pond into the north part of Monroe. Just below the pond 

 there are outcrops of clay slate. To the south there are ledges dipping 

 75° S. 30° E., which, if protracted, would pass beneath the pond. Some 

 of them occupy the line of strike of Helderberg outcrops farther south. 

 The north-westerly dip of this band of slate begins about half a mile 

 below the outlet. Running beneath the west end of the pond is a fine 

 lot of Lyman conglomerate. At a mill the dip of it is 80° S. 60° E. 

 The west border of this series, at A. Knapp's, shows the dip S. 40° E. 

 The green schists succeed the white on the west, dipping 85° N. 40° W. 

 This is succeeded by the slates of the Dodge Pond vicinity, supposed to 

 dip south-easterly. After that comes in the westerly belt of Lisbon green 

 schist, agreeing in position with its description on the three previous fig- 

 ures. The slate comes out near the school, by A. L. Dike's, at the east 

 base of the range, indicating a fold. The copper schists occur in the 

 Alden Miner pasture lot, where excavations to a slight degree have been 

 made. They probably pass into the Swan and Garland property, in the 

 next lot adjacent upon the north. The dip of the cupriferous beds is 57° 

 S. 35° E., which extends to the top of the mountain. 



Upon the Monroe side I have not seen the exposures for more than a 

 mile below the summit. I have reason to believe the rock there is the 

 Lisbon green schist; and that there are copper openings to correspond 

 with the structure reproduced in Fig. 30. Two openings for copper have 

 been seen about midway between the crest of the ridge and the river. 

 Way's copper beds dip 80° S. 35° E.; Mason's, 75° S. 35° E. No rocks 

 were observed west of these ledges near the road. The country falls off 

 to the west, and seems to be mostly covered by drift. 



Fig. 33 exhibits the position and character of the strata near the south 

 line of Littleton, from S. Albee's house to the top of Blueberry mountain. 

 The older clay slates make up the principal mass of the mountain. On 

 top they dip 75° N. 20° W. A few rods north there is a local disloca- 

 tion, the dips of 80° N. 33° W. and 20° S. W. adjoining each other. The 

 slates are black, and contain crystals of pyrites. Immediately adjacent, 

 near a school-house, there is a coarse conglomerate. From the northern 

 slope of Blueberry hill to Mulliken brook the soil is fertile, and covers 

 most of the ledges. Near the stream there is a mixture of Helderberg 



