558 LOCALITIES. 



Two or three miles north of Johnson village, there is a bed of limestone upon the land of Eobert Balch, 

 Esq. The prevailing color is white ; but varieties may be found of blue, pink, and light brown colors. The 

 bed is fifteen feet wide, and is associated with a chloritic conglomerate or sandstone. The strata are some- 

 what contorted, but their general direction is N. 40 W., and their dip is 50 N. E. A small bed of galena 

 occurs in this bed which is one inch wide and four feet long, so far as it has been explored. The rock is 

 burnt for lime, and an excavation has been made in it fifteen feet wide and two rods long. The rock adja- 

 cent contains many seams of carbonate of lime. In the vicinity there is a cave one hundred feet long, which 

 may once have been occupied by limestone. Prof. Thompson visited a bed of limestone in the northwest part 

 of Johnson, and found it to be " white for the most part, but with seams and cavities containing the black 

 oxyd of manganese, which in burning gives a dark color to the lime." 



There is a bed of white granular limestone in Waterbury, showing itself in several places along the road 

 from Johnson to Bakersfield. The limestone is generally friable, but is in some places nearly as compact 

 as marble. It is only a few feet wide. All the beds we have described after the Plymouth deposit are in 

 talcose schist. 



In the northeast corner of Bakersfield there are beds of white limestone in talcose schist, upon the land 

 of Mr. Hardy. These beds are from six to ten feet thick, with the direction of N. 5 E., and they dip 

 75 W. Veins of white quartz cut through the beds transversely. The limestone is composed of carbonate 

 of lime 92.9, carbonate of magnesia 5.5, and of silica 1.6. 



There is said to be a bed of white limestone in Richford. It must belong to the same range with tho 

 beds in Bakersfield and Waterville, all of which lie west of the Green Mountain anticlinal. 



In the Report on the Geology of New Hampshire, Dr. Jackson has given an analysis of azoic limestone 

 from Lunenburgh in Vermont. It is from Col. White's quarry. It must be from a bed in the eastern range 

 of talcose schist. 



In Columbia, N. H., only two miles east of the Vermont line, we visited a bed of limestone which may 

 be of as much service to the citizens of Vermont as of New Hampshire, as it is in a region where limestone 

 is very scarce. It is a blue, compact, indurated rock, forming a bed four feet thick in mica schist. It dips 

 25 E. It closely resembles the limestone of Bernardston in Massachusetts, except that it has been indur- 

 ated. The mica schist adjacent still more closely resembles the mica schist of Bernardston. 



Geological Position. 



Like the beds of steatite and serpentine, the beds of saccharoid azoic limestone are of the same age as 

 the gneiss and talcose schist which inclose them. The beds of limestone are more abundant in gneiss than 

 were the beds of steatite. Like the magnesian beds, the calcareous beds can probably be assigned to two 

 lines of different ages, and they are also found upon both sides of the Green Mountains in the north part of 

 the State. By examining the course of these beds upon the map, a clearer idea will be obtained of their 

 stratigraphical relations, than by a prolonged description. 



The origin of azoic limestone must have been similar tg that of the Eolian limestone, under which we 

 have presented our views. 



