40 ROCK FLOOR OF GREATER NEW YORK. [btjll.270. 
Summary of records of borings made in New York and vicinity — Continued. 
1. BORINGS BENEATH CHANNELS ON WATER FRONT— Continued. 
Serial 
num- 
ber. 
Location. 
Depth of boring to rock. 
As given. 
Referred 
to U. S. 
datum, 
Sandy 
Hook. 
Kind of rock, if known. 
HinsoN RIVER SECTIONS. 
Reefi mil' west-southwest of pier A.a 
234 Government boring 
Bedloe Island. b 
235 Well 1 50 feet north of fort 
236 
237 
238 
239 
240 
241 
242 
243 
244 
245 
246 
247 
248 
249 
250 
251 
252 
253 
McAdoo tunnel, between 15th street, Jersey 
City, and Morton streets 
From bulkhead. New York City — 
1,950 feet west of wall 
1,730 feet west of wall 
1,640 feel west of wall 
1,570 feet west of wall 
1,480 feel west of wall 
1,380 feet wesl of wall 
1,260 feet west of wall 
1,215 feet west of wall 
1,120 feet west of wall 
1,030 feet west of wall 
960 feet west of wall 
830 feet west of wall 
800 feet west of wall 
660 feet west of wall . 
515 feet west < >f wall 
Pennsylvania, Ni w York and Loan Island 
Railroad tunnel.d 
850 feet west of Weehawken bulk- 
head line (D). 
750 feet west of Weehawken bulk- 
head line (C). 
Weehawken pierhead line ( A) . . . 
28 
4:: 
+285. 4 
+204. 5 
+ 77 
30 
-156 
-154 
107.6 
105 
102. 1 
-100 
-101.7 
- 99 
100.4 
98 
98. 9 
96 
96.2 
94 
97.7 
- 95 
95. 9 
- 93 
92. 4 
- 90 
- 84.8 
- 82 
— 78.4 
- 76 
- 84.8 
- 82 
- 82.5 
- 80 
-107. 5 
-105 
13 
93 
■221 
Rock or bowlder. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Gneiss. 
Do. 
Do. 
Rock containing " large 
aGuthrie, W. L., second lieutenant. Corps of Kngineers, U. S. Army. 
ft Long, C O., superintendent, American committee on Statue of Liberty 
quantity ot mica " probably gneiss. A 6-inch hole was drilled 57 feet into the soft rock. Statue o 
Liberty has foundation on hardpan and bowlders 15 feet below surface and 10 feet above mean higl 
water. 
(■Jacobs, Chas. M., chief engineer, from borings made by C. B. Brusb, C. E. Datum, mean bigl 
water No. 26b encountered obstruction of unknown character. 
rt. Noble A., and Jacobs, Chas. M., chief engineers. Depths as reported referred to datum 300 fee- 
below mean high water; Nos. 251, 252, and 253, diamond-drill (core) borings; 254-262, wash borings. 
