No. 275. 1 
87 
IV. QUARTZ ROCK. 
This rock is of small extent where it is visible; but from the locali- 
ties where it has been seen being nearly in a line, it is believed that it 
forms a continuous stratum through a portion of Westchester and Pt- 
nam counties. It is probably a continuation of the stratum described 
in the Second Annual Report, as forming a part of Peaked and Elbow 
mountains in Amenia and Dover, in Dutchess county, and as probably 
a continuation of that described by Prof. Hitchcock, in the west part of 
Massachusetts.* The granular quartz rock crops out on the bank of 
Peekskill bay of the Hudson river, about half a mile N W of Peekskill 
landing, near Hall's Point. The strata are nearly vertical, leaning a 
little to the WNW. It ranges up the " Peekskill Hollow." It is seen 
in connection with the iron ore, at Bradley's ore bed, in " Peekskill 
Hollow," about ten miles from Peekskill, and again it occurs near 
Boyd's corners, in Carmel, Putnam county. It is quarried to a small 
extent, near Boyd's corners, for door steps, hearth stones, and other pur- 
poses. It splits out in regular slabs, from 3 to 9 inches thick, and 3 to 
7 or 8 feet . square, with an uniform plane surface, and is admirably 
adapted for a flagging stone for streets, cellars, &c. Other locations 
maybe indicated in the descriptive geology of the county; but only one 
was observed, where the stone was good for quarring for flag stones, 
near water transport. 
This belongs to , of Peekskill. It is at the mouth 
of Peekskill creek, a little north of Hall's Point; and it is believed that 
a valuable quarry of flagging stones, of the granular quartz rock, may 
be opened at this place. The strata are nearly vertical, and the stones 
may be split oft' with great ease, if the quarry be opened in a proper 
manner. The flagging and curb stone used in New- York, and many 
other towns, are now brought from the Bolton and Haddam quarries, in 
Connecticut, and from the graywacke quarries in Greene county* 
Some of these stones, which are very beautiful, sell for fifty cents per 
square foot. The Bolton and Greene county stone, are carted from 
eight to sixteen miles over bad roads, and then shipped to a market. 
If stone, as beautiful and as durable, can be dug on the shore of the 
Hudson, where no cartage is required, and where the expense of quar- 
rying is no greater than at the quarries mentioned, and where the busi- 
ness is now very lucrative, it follows, that such quarries on the shore of 
the Hudson would be very valuable. 
P * Vide Second Annual Report on the Geological Survey of New- York, page 172. Vide 
Hitchcock's Geological Reports of Massachusetts, 1833, pages 22, 321, 
