556 LOCALITIES. 



45 W. An analysis of this rock shows its composition to be, carbonate of lime 65.41, carbonate of mag- 

 nesia 30.05, carbonate of the protoxyd of iron 1.61, insoluble matters 2.58. 



There are two or three large beds of limestone or dolomite in the east part of Jamaica, which we have 

 not explored. Their general position upon the State Map of Mr. Walling is indicated by the word " lime- 

 kiln," in the northeast part of the town. Their line of strike will by no means coincide with that of .the 

 beds in Somerset and Stratton. One belongs to A. Twitchell, Esq., and another to W. Thayer, Esq. We 

 understand that there is a third bed in the vicinity. They are in talcose schist. In the gneiss in the west 

 part of Townshend we found several strata of dolomite. These may indicate the presence of a larger bed 

 in the vicinity. 



Near the south line of Athens there is a large bed of dolomite, which is quarried by William Holbrook, 

 Esq. It is in gneiss, running N.E. and S.W., and dipping 48 N.W. There are about twenty-five feet 

 thickness of dolomite which is distributed through three or four beds. This is one of the best beds we 

 have seen in the State from which to obtain specimens of highly colored dolomites. The white saccharoid 

 variety prevails ; but red, yellow and green colors, of various shades, abound. Associated with the dolo- 

 mite are various minerals which usually accompany steatite rather than dolomite, such as hornblende, 

 chlorite, talc, epidote and tourmaline. This fact may throw light upon the origin of steatite. There is a 

 bed of limestone in gneiss in Mount Tabor. Its locality is indicated by the word " limekiln," on the 

 State Map. 



In the south part of Windham there is a bed of limestone. In the town of Andover there is a limekiln 

 upon the land of Mr. Hutchins, in the west part of the town ; also another in the north part of the town. 

 These kilns must, of course, be supplied with limestone from their immediate vicinity, and hence we con- 

 jecture the existence of two beds of limestone. East of Simonsville, also, there is a considerable amount of 

 limestone. We were informed that there were very few farms in the territory of Andover upon which some 

 " bunches " of limestone might not be found. In the south part of Ludlow there is a bed of limestone of 

 considerable thickness near the house of A. Adams. It is traversed by veins of quartz. It is not pure 

 white, but rather a gray color. An old limekiln is located by its side. In the west part of Ludlow there 

 is a bed of dolomite, twenty feet wide, upon the land of Levi Lawrence, Esq. It is connected with steatite. 

 The bed runs K 20 E., and dips 65 E. These beds of limestone and dolomite in Windham, Andover 

 and Ludlow, are in the talcose schist. 



There are three beds of dolomite in the gneiss of Cavendish. One of them is half a mile east of the 

 village, upon the south side of Black River. It belongs to Christopher Webber, Esq. Beautiful specimens of 

 white and colored dolomites may be collected here. Much of it is of a dingy-white color, with thickly dis- 

 seminated grains of translucent quartz, in consequence of which it is quite friable. It runs north and south 

 and dips 30 W. It is about, twenty-five feet thick, and can be traced three or four miles in the direction of 

 the strike. It appears in the east part of the cut in the railroad at Cavendish, which is represented in 

 Figs. 298 and 299. Its route lies along the course of the R. and B. R. R. in the old river bed between 

 Cavendish and Gassett's Station. Probably the former course of the river was partly determined by 

 the softer character of the rock ; as we think is also a part of its present course north of the Falls. This 

 dolomite is composed of carbonate of lime 53.8, carbonate of magnesia 43.3, and silica 2.9. At the Upper 

 Falls on Black River, not far from the east line of Cavendish, there is another fine bed of white dolomite, 

 parts of which contain crystals of tremolite in abundance. There is a still larger bed in the north part of 

 the town, which lies partly in Cavendish and partly in Weathersfield. 



In Weathersfield the dolomite is abundant. It is continuous in the vicinity of Black River from near 

 Perkinsville to Downer's tavern, near the west line of the town. Its direction is about N. 10 W. There 

 is a small undulation in the strata here, which is probably the cause of the continued appearance of the 

 dolomite. We are inclined to think that the dolomitic beds at Amsden's mill, and Craigue's quarry upon 

 a branch of Black River may be the same bed as that just described, but repeated by undulations in the 

 strata. The one at Amsden's mill dips 60 W., the one at Craigue's quarry dips 16 E. They both are 

 on the east side of the river, and not more than sixty rods apart from each other. As the strikes coincide, 

 we suppose these beds to be upon the opposite sides of the same anticlinal axis. The strike at Amsden's 



