Cushing — Geology of Clinton County. 



with these, is a small outcrop of basic gabbro of the type that occurs 

 interbanded with the gneisses. Exposures elsewhere on the ridge were very 

 difficult of access and were not reached, but it was thought probable that the 

 whole was of gneiss. However, Professor Kemp reports gabbro from the 

 ridge just over the border in Wilmington, and the place where the gneiss 

 ceases and gives way to gabbro must be left for future determination. 



Series II. Not far from the Franklin line, in the valley between 

 Catamount and Leggett mountains through which Kittle Black brook 

 meanders, occur the only exposures of the limestone scries w hich have been 

 found in the county. But three exposures were found, and the extent 

 eastward is uncertain, but the belt passes westward into Franklin county, 

 good exposures occurring around Franklin Falls. 



About two miles east of the Franklin line, and lying close up against tin- 

 side of Catamount mountain, a massive limestone occurs in which a 

 considerable opening has been made and the rock burned for lime. The 

 limestone is coarsely crystalline and much of it quite pure, but other parts 

 contain much green pyroxene, sometimes in great bunches making up the 

 larger part of the rock, sometimes more evenly scattered through the mass. 

 In places graphite and phlogopite occur, but in no great quantity. Locally 

 there is considerable titanite, and there is one finely crystalline, narrow band 

 composed about equally of titanite, pyroxene and calcite. A few small, 

 slender green apatites were noted, but are not common. The breast in the 

 limestone is about twenty feet high and 150 feet long. Not far distant, 

 farther up the ridge, basic gabbro crops out. 



By the roadside, some fifty rods south of the limestone, is a small outcrop 

 of a crumbling, rusty gneiss, consisting of a nearly colorless monoclinic 

 pyroxene and microperthitic orthoclase. In addition it contains some 

 sillimanite, titanite and magnetite, quite a, little pyrite, and large scales of 

 graphite along the planes of foliation. Associated with it is a band of basic 

 hornblende-plagioclase gneiss. These gneisses are like those associated with 

 the limestone elsewhere and belong to this series. No other outcrop of such 

 gneiss has been seen in the county. 



Series III. The massive, northeastwardly trending ridge of Catamount 

 mountain is composed of gabbro, and is probably a prolongation of the area 

 over the border which makes up the Whiteface mountain mass. The two are 

 separated by a wide, drift-filled depression which is probably occupied by the 

 limestone series. The Catamount ridge is suddenly cut off on the southwest, 

 at right angles to the trend ofuthc ridge, and presents in that direction a quite 



