32 
ROCK FLOOR OF GREATER NEW YORK. 
[bull. 270., 
Summary of records of borings made in New York and vicinity-Continued. 
■ L BORINGS BENEATH CHANNELS ON WATER FRONT-Continued. 
Serial 
num- 
ber. 
49 
50 
51 
52 
53 
54 
55 
Location. 
56 
57 
58 
59 
60 
til 
62 
63 
64 
65 
66 
67 
68 
east rivek front — continued. 
Miscellaneous— Continued. 
30 feet north of 81st street— 
4 feel east of bulkhead line . . 
South line of 91st st. (produced i 
25 feet east of bulkhead line. . 
35 ft south and 45 ft. cast of ■"><> 
L50 ft. south and 5 ft. west of 51 . 
in feel east of 52 
10 feet easl of 53 
160 feet south and 10 feel easl 
of 51. 
EAST RIVEB SECTIONS. 
East /.'"■' r Gas Company's tunnel.a 
New York bulkhead — 
LOO feet west of line 
Center of west channel 
Blackwells Island— 
Wes1 shore 
East shore 
Center of east channel 
Long Island City— 
L00 feet easl of shore 
East River bridgt No. .'.'- 
Brooklyn tower — 
Center line of bridge (D) 
' (B) 
North edge of pier (M) 
(K) 
South Pier (D) 
(B) 
(C 2 ) 
(H 2 ) 
Depth of boring to rock. 
As given. 
Referred K - , of rock if known 
to l . s. 
• 
ii 
datum, 
Sandy 
Hook. 
1.9 
21 
35 
- 37 
\\ 
L6 
20 
22 
20 
22 
40 
VI 
17 
L9 
Fine brown sand. 
L06 
-108 
-111 
114 
110 
( iueiss. 
Mica schist. 
( iueiss. 
Do. 
Limestone. 
IIS (iueiss. 
85.0 
so. 4 
104.27 
-102. 30 
— 85.0 
80. I 
89. -4 
81 
si 
101 
.si 
( iueiss. 
Do 
Do. 
«Aims, Walter. I.. .lour. Assoc. Eng. Soc, vol. 14, L895, p. 109, pi. 
&New York department of bridges. Diamond-drill borings; datu 
high water. 
