GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 395 



6. Calcii-erous Mica Schist. 



This name is adopted from the Vermont final report. Professor C. B. 

 Adams called them "Calcareo-mica slates." IVAh the expressions really 

 ought to be replaced by a geographical designation. 



The formation consists of mica schists, micaceous quartzitcs, argilla- 

 ceous schists, and especially siliceous or bluish micaceous limestones. 

 The limestone is the most abundant at the north end of the Vermont 

 deposit, while the mica schists predominate in Massachusetts. The for- 

 mation is broadest in Caledonia and Orange counties, narrowing nearly 

 one half as it enters Canada. Below White River junction it divides, the 

 broadest area running down to Proctorsville, where it terminates, and the 

 other following the west side of the Connecticut through the state, with 

 a nearly uniform width, enlarging a little near the Massachu.setts bound- 

 ary. The strata are less highly inclined in the broadest portions of the 

 area, and they are much tilted up where the band is the narrowest. 



Two areas of the formation occur in New Hampshire. One is in Cole- 

 brook, Columbia, and Clarksville ; the other is in the present field of de- 

 scription, extending from the southern part of Lebanon to Charlestown. 

 The first is isolated ; the second is a part of the great Vermont range, 

 separated from it by the Connecticut river. 



Passing up Blood's brook, from the last of the hornblende rocks to 

 Meriden, the rocks are mostly soft, greenish schists, commencing near 

 the mouth of the tributary following down the valley on the west side of 

 Morgan hill. We find a sandy schist, with the dip 80° N. 30° E., at the 

 mouth of this stream. About a mile higher up, the greenish schist dips 

 45° westerly; and the rocks have essentially the same position all the 

 way to Meriden, save that the angle of inclination is constantly becom- 

 ing steeper, reaching 75"^ or 80'^. Narrow seams of limestone occur in 

 the square fronting Kimball Union Academy. The easterly dip begins 

 just east of the academy; and the rocks may be followed to the clay 

 slate band near school-house No. 16. The hills to the north of Meriden, 

 as Batchelder and Morgan, with the Pinnacle in the extreme south part 

 of Lebanon, are composed of the same formation, the axial line running 

 from the academy to T. Cutts's, and perhaps to the anticlinal recently 



