280 
ANNALS NEW YORK ACADEMY OF SCIENCES 
Deep Well of the N. Y. Quinine & Chemical Co. 
Serial No. 
Original 
mark 
Location 
Depth 
to rock 
To rock 
U. S. 
datum 
Rock 
penetra¬ 
tion 
Form¬ 
ation 
Variety and remarks 
297 
N. 11th and 
100' ± 
20 0 ' + 
Ford. 
A quartzose granitic 
Berry Sts. 
from 
gneiss. Quartz biotite 
surface. 
feldspar. 1 
East River and the Bay 
Serial No. 
Original 
mark 
Location 
Depth 
to rock 
To Rock 
U. S. 
datum 
Rock 
penetra¬ 
tion 
Form¬ 
ation 
Variety and remarks 
298 
St. George’s Reef, 
off New Brighton 
Manh. 
Mica schist, a coarse 
pegmatite with a quartz 
vein. 2 
299 
Diamond Reef 
off the Battery 
? 
Coarse pegmatite (prob¬ 
ably Manhattan). 3 
Recent Exploratory Borings of the New York City Board of Water Supply 
(Made since the original study) 
The following borings have been made in exploring for condition of bed¬ 
rock along the line chosen for the proposed distribution conduit intended to 
carry the new Catskill Avater supply. Some of them, those made earliest, 
have been recorded on the accompanying map. So far as these explorations 
have gone, they substantiate the interpretation of areal geology and structure 
offered in this paper. The holes given are all on the Lower East side be¬ 
tween the East River and the Bowery. 
1 Samples are all fine granular fragments due to the method of drilling. Nine samples 
in bottles are preserved in the office of the company. 
2 Three specimens (fragments) are to be seen in the Museum of the Staten Island Natural 
History Society. 
3 A piece of rock from this reef was seen in the office of the Chief Engineer of the Departmen t 
of Docks and Ferries. 
