372 STRATIGRAPHICAL GEOLOGY, 



together with the slate itself, is a little suggestive of Huronian. Towards 

 the village of North Charlestown I have an observation of a dip of 80° 

 S. E. In Springfield, Vt., near school-house No. i, the slates crop out 

 strongly, dipping 50° S. E., and holding auriferous quartz veins. There 

 is also an observation of slaty rocks at N. Spaulding's, in the north part 

 of district No. 6. These outcrops are the last seen of this range, and it 

 is believed to be cut off by the rising up of the quartzite and Huronian 

 in Springfield, about Skitchawang mountain. The line of slate outcrop 

 is therefore situated between two Huronian masses, — Barber's mountain 

 to the north in Claremont, and near Skitchawang to the south in Spring- 

 field. It is possible that the Huronian hills existed before the mud of 

 the Cambrian period was deposited beneath the quiet waters. Beginning 

 in Plainfield, this band of slate has Coos schists upon the east ; next, are 

 quartzites in Claremont ; Coos schists in North Charlestown ; and, finally, 

 the Huronian and Coos quartzite in Springfield. On the west side the 

 border is uniformly the Calciferous mica schist. It will be quite desir- 

 able, in order that these formations be thoroughly understood, to investi- 

 gate further the south-west end of this slate range. 



COOS QUARTZITE. 



There are fifteen or twenty areas of quartzite near the eastern border 

 of the Connecticut Valley district, between Lisbon and Claremont, which 

 are grouped with the Co5s slates on account of their proximity and inti- 

 mate association. Some of them repose upon gneiss, entirely isolated 

 from all connection with the staurolitic schists. They also extend to Ber- 

 nardston, Mass., and may have some connection with the quartzites con- 

 nected with the Helderberg limestone there. For these reasons, they 

 are described by themselves, and are distinguished from all other forma- 

 tions upon the map. 



Mr. Huntington has examined most of these areas, and will describe 

 them in the next section. I will only speak of a few things which he 

 has not seen. 



Starting at Landaff, there are one or two isolated patches of sandstone; 

 and then commences the range which is so curiously developed among 

 the mountains in the west part of Benton and eastern Haverhill. After 

 passing the gap of the Oliverian stream in East Haverhill, there succeeds 



