J. D. Dana— Geology of Westchester County, N. Y. 3138 
Art. XLITI.— Geological Relations of the Limestone Belts of 
Westchester County, New York; by James D. Dana. 
York Island. 
As the outcrops of limestone on New York Island will soon be 
graded away, I here supplement my notice of the 122d street 
1. Section of the Mott Haven belt of Limestone on 122d St., 
New 
ne : 
five feet wide; 4, seven feet; and ¢, in view to the eastern limit 
of the open lot, 32 feet. The band g looks, at first, as if it were 
the westward dipping portion of a, but it is in reality a seam of 
> . 
granite or granitoid gneiss, in the schist. The three limestone 
masses @, b, c, appear here to be independent beds. But over the 
\\ 
Westward, where it is not known to occur. e schist is much 
rusted and its bedding poorly exposed: moreover, the outcrops 
of limestone south of 122d street differ widely from those on its 
horth side; and for these reasons it is difficult to reach any posi- 
tive stratigraphical conclusions. 
18 locality is on the western border of the Mott Haven lime- 
stone belt. As to the eastern border, nothing is here indicated, 
t i t 
bey pe this, that the limestone increases in amount to the east- 
ard, 
