METAMORPHIC ROCKS. 457 
of limestone is about a quarter of a mile broad, and extends from Sparta through Mount- 
Pleasant. 
A bed of dolomitic limestone occurs near the county poor-house of Westchester county. It 
is called sandstone by the people, because it crumbles to sand by exposure to the weather. 
The same bed was seen at intervals to Dobbs’s ferry. It crosses the valley of a small stream 
near the church on the hill, and it forms the shore below Dobbs’s ferry. A quarry is opened 
in this bed one-eighth of a mile from the shore of the Hudson, a mile below Dobbs’s ferry, 
and a railroad and wharf have been constructed to facilitate the transport and embarkation of 
the marble. Lime has been burnt from this stone on the shore, and some of the rock has 
been transported to New-York and burnt. This limestone is intersected, and was cut through, 
in excavating the Croton aqueduct, between Tarry town and Dobbs’s ferry. 
Limestone crops out on the hill east-southeast of Peekskill. It is much contorted and va¬ 
riously clouded, and some of it may, perhaps, be used for an ornamental marble. It also 
crops out near the lower dock at Peekskill, and is bounded on the east by hornblende rock. 
It ranges nearly east and west, and is on one of the transverse axes of disturbance. 
A bed of limestone occurs five miles from Peekskill, on the road to Crum ponds. It is a 
dolomilic limestone that is used for marble, for making lime, and for sand. For the latter 
purpose, the crumbling rock is crushed by a stone roller, and the mortar is said to set well 
in which it is used. Similar sand in some other parts of the country will not form a strong 
mortar. 
Limestone of good quality occurs on Abraham Miller’s farm, on Mill creek, which is the 
outlet of Crum ponds. The locality is stated by Prof. Cassels, who examined it, to be five 
and a half miles southwest of Somerstown plain, and three miles south-southeast of Crum- 
ponds village. The strike is N. 30° E., and dip seventy-five degrees eastwardly. Mr. Mil¬ 
ler has made lime from the stone of his quarry for four years. He makes five kilns of lime 
per annum, each of six hundred bushels, the average price of which is fifty cents per bushel 
at the kiln. Twenty cords of wood,'at three dollars per cord, are used to a kiln, and six 
days are required for the burning. The limestone lies in high knobs, and can be easily opened 
on the northeast side, and Prof. Cassels thinks good marble may here be obtained. This 
locality is about two miles west of Whitlock village, through which it is supposed the New- 
York and Albany railroad will pass. 
Limestone was seen by Prof. Cassels on Plumb creek, about a mile west of Somerstown 
plains, on the Peekskill road. It occurs along the road for about half a mile. 
Limestone occurs about two miles north of Whitlockville. It is also said to occur on Mr. 
Todd’s farm, about a mile east of the locality above, where it has been used for making lime. 
Prof. Cassels saw it again about three-fourths of a mile south of the crossing of Titicus river. 
It is here abundant, and fine quarries might be opened. It crops out on the road side occa¬ 
sionally all the way to North-Salem, where it is abundant and highly crystalline. A stratum 
of limestone was seen by Prof. Cassels about a mile north of Owenville, and again about a 
mile and a half west of Peach pond. 
A bed of limestone is quarried for lime about thirty or forty rods west of Hardy’s hotel, at 
Geol. 1st Dist. 58 
