There are indications of a more eastern belt along the Saw-Mill River Valley just north of the city. On Gnissy Sprain Brook a small area exists with a width to the south of live iiundred yards. On the IJronx River a lime-stone belt begins near Bronx ville, and taj)ers out to the south, while to the north, and for the most of its course, it is divided into two parts, separated by a band of mica-sihist and gneiss. The Hastings belt occurs along the Hudson to the north of Y(mkers.
HISTORY OF WESTCHESTER COUNTY.
In the middle section of the county, in the Saw-Mill River Valley, a large lime-stone area commences about two and a half miles north of Ashford, and widening at East Tarrytown, continues northward to a near junction with the Pleasantville area. This lastmentioned area is also broad and sinuous in its course, terminating just north of Chappaqua Depot. The Sing Sing belt commences south of the depot on the Hudson and extends north-northeast nearly to the boundary of the town of Ossining ; it also branches eastward up a small valley towards the Camp Woods. 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