Half a mile east of the village of Croton occurs a small area without distinguishable features, and south of the Croton River a narrow area extends from near " Quaker Bridge " to the forcation of the river at Huntersville. At Merritt's Corner, and on the east border of Croton Lake, as well as near Bedford Station, small areas of lime-stone are indicated. East of the Pleasantville belt, on the border of New York and

THE COBBLING-STONE, IN SOMERS.

Connecticut, lies a lime-stone area, which extends along the course of Byram River to its source in Byram Lake. To the northeast of Byram Lake, following a valley along the head-waters of Mianus River, as well as another along that of Stone Hill River, the outcroppings of lime-stone indicate an area which completes the list of areas in the middle section of the county.

The areas of the northern section of the county to some extent tend toward the east and west in trend and in the strike of the beds. The large eastern area of the northeast extends into Connecticut ; that at Cruger's Station lies mostly to the south and east of the station. At Verplanck's Point, and up Sprout Brook Valley or Canopus Hollow, extends an area nearly five miles in length.

Prof. Dana regards Westchester County as topographically a southern portion of the Green Mountain elevation ; that the grade of metamorphism follows the same rule as to the north -- that is, it is of greatest intensity to the eastward and to the southward. It is in accordance with this that the least degrees of metamorphism are found in the lime-stone and associated schists of the vicinity of Peekskill, in the northwest corner, while along the central and eastern portions of the county, and in the western, also, south of the Croton, the crystallization is commonly very coarse; that the lime-stones have the same kind of associated rocks -- that is, of mica-schists and gneisses -- as the eastern and more metamorphic portions of the region in Connecticut ; that the lime-stones have a like paucity in disseminated minerals and similar occurring species with those of Connecticut ; and that the ordinary normal trend of the rocks -- north 10° east to north 20° east -- is very nearly the average trend of the beds of lime-stone and associated rocks in the Green Mountain system.