GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 377 



the indication of an anticlinal on the west side. With this latter range 

 would naturally be associated the Bald Mountain outcrops in the north- 

 east part of Claremont. There are three bands there, at least one of 

 them being- a beautifully spotted rock, with white, flattened pebbles in a 

 dark, slightly argillaceous paste. One of the dips is N. 80° E. An ob- 

 scure quartzite occurs a short distance above J. Clark's saw-mill, which 

 may connect with one of the Bald Mountain exposures. After another 

 look at the map, it seems possible that these eastern ranges are all con- 

 verging towards the Craft's Hill range. The nucleus of Bethlehem gneiss 

 undoubtedly causes this convergence, and further exploration may pos- 

 sibly illustrate this feature more strikingly. The most western of the 

 eastern ranges, near the mouth of Stony brook and Bald hill, is the one 

 most like the Craft's Hill band, and the one that would most naturally 

 join it in case the convergence became conjunction. 



Croydon Range. One gets the impression that the whole of Croydon 

 mountain, in Grantham and Croydon, must be composed of quartzite. 

 Plans that were made for the exploration of these mountains have failed 

 to be carried out; and therefore the coloring of this area must not be 

 regarded as necessarily correct. Beginning quite high ujd, near Cranberry 

 pond, with westerly dips, the rock continues southerly into the Grantham 

 mountain, the land rising all the way. Traversing the road at the east 

 foot of the Grantham mountain, one gets glimpses of supposed quartzite 

 ledges on the summit. In the notch, where the Croydon road passes 

 over to Cornish Flat, the quartzite is abundant. At the east base it 

 dips 75° N. W., or at a much higher angle than the underlying gneiss. 

 After passing a band of white, vitreous quartz in the ascent, there is a 

 mica schist dipping 50'' S. 80° E.; and this is probably the range which 

 extends northerly to the Croydon trigonometrical station occupied by 

 the Coast Survey party in 1874. At the summit there is more quartzite, 

 dipping 50° southerly. The south end of Croydon mountain is certainly 

 quartzite, dipping 70° N. 75° W. and 60° N. 85° W., and to some extent 

 is interstratified with varieties of mica schist in the district a fourth of a 

 mile west of the Croydon mine. I have no evidence to show that the 

 quartzite extends out of Croydon into Newport. 



Claremont Area. There may be quartzite upon the north-west side of 

 Green mountain. There is but little adjoining the slate by C. Dean's, on 



VOL. II. 48 



