3/8 STRATIGRAPHICAL GEOLOGY. 



the south side, but it widens southerly. It is quarried near R. Page's, 

 and is near hornblendic, chloritic, and garnetiferous schists. At A. C. 

 Dodge's it is a conglomerate, composed of flattened pebbles, dipping 75° 

 S. 85° E. There is said to be quartzite on the south side of Sugar river, 

 on the east side of Bible hill. If so, it is the natural continuation of this 

 range. I have seen there only a very large vein of white quartz, cutting 

 the mica schists west of D. W. Barney's, near the south line of Claremont. 

 It appears that the gneissic rocks east of this range belong to the Beth- 

 lehem group ; and that around its north end, in Claremont and Newport, 

 the same band occurs, perhaps all the way, though colored upon the map 

 only where it has been seen. 



5. Coos Schists and Slates. 



Most of the area between the Huronian and the Quartzites is occupied 

 by mica schists, clay slates, and a few hornblende schists, believed to be- 

 long to a group of strata not well understood, and therefore described 

 under a local geographical name of no original geological significance. 

 Their easy passage into the group described in the Vermont geological 

 report as the Calciferous mica schist, makes it difficult to decide between 

 them in many cases. I am sometimes disposed to maintain that the two 

 were synchronous, the calcareous layers forming in deeper waters than 

 the sandy and clayey sediments of the Coos series. 



There is a natural separation between the Coos schists of the Ammo- 

 noosuc and Connecticut Valley areas. The Haverhill gneisses form an 

 impassable barrier between them, not likely to have been overcome un- 

 less it were far back in Paleozoic time. The rocks are largely argillo- 

 micaceous schists in the south part of Haverhill. Perhaps the most 

 northerly outcrop of it is on the south slope of Knight's hill, dipping 80° 

 N. 20° W. They crop out on the ridge east of Wood's pond, with an 

 inclination of 75° N. 40° W, Fig, 48 shows the order and position of 

 the formations near the southern line of Haverhill. Leaving the gneiss 

 inclined only twenty degrees westerly, the quartzite first appears, dipping 

 45° N. 30° W. Then we have wrinkled staurolite slate, with a smaller 

 dip. This is followed by hornblende schist, dipping 80° N. 80° W., occu- 

 pying about half the space between the quartzite and the turn of the road 

 down Eastman's brook; afterwards, in the whetstone slate at a quarry. 



