HARLEM RIVER FRONT AND SECTIONS. 
43 
Summary of records of borings made in New York <ut<l vicinity — Continued. 
1. BORINGS BENEATH CHANNELS ON WATER FRONT— Continued. 
Location. 
Depth of boring to rock. 
As given. 
Referred 
to U. S. 
datum, 
Sandy 
Hook. 
Kind of rock, if known. 
HARLEM RIVER FRONT AND SEC- 
TIONS — continue* 1 . 
Macomb' s dam, Central Bridge.a 
Near east bulkhead line — Cont'd. 
West pier 
Central pier 
East pier 
On line AOOfeet east of Central Bridge. '• 
Al >out 100 feet east of west shore 
30 
-24 
-27 
-27 to -29 
Middle of river 
East shore 
600 feet east of east shore. 
2,400 feet east of west shore 
2,800 feet east of west shore 
N. V. C. R. R. bridge. 
Shermans Creek c 
r-2i 
' l -23f 
- 6 to 
-38. 2 
-43. 1 
-74.9 
-51 
U5th street bridge, d 
West approach pier 
West rest pier 
Center pier 
East rest pier 
East approach pier 
Rapid-transit tunnel, e 
1,000 feet west of bulkhead line. . 
600 feet west of bulkhead line 
West bulkhead line 
Center of channel 
75 feet west of east bulkhead line. 
150 feet east of east bulkhead line. 
300 feet east of east bulkhead line. 
900 feet east of east bulkhead line. 
120 
-61.8 
66.7 
61.38 
-63. 05 
-75. 08 
33 
27 
30 
30 
25 
9 
u 
Gneiss. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
No rock. 
White marble. 
Do. 
Do. 
Do. 
Hardpan. 
Limestone. 
Do. 
Do. 
Do. 
Do. 
No rock. 
Limestone 
Do. 
aGay, Martin, assistant engineer, New York department of bridges .'..■. 1cfi0 „ --. 
6 Department of public parks, quoted by Russell, I. C, Annals New ^ ork Acad. Sci., vol. 2, 1X82, p. 76, 
assumes that borings are referred to mean low water. .,,..., hllt( . A . n) 
c Chase, F. L., engineer of bridges, New York Central Railroad. Piles go down 120 feet, but do not 
reach rock. 
d Allen, F. W., engineer for contractor. 
eRice, Geo. 8., acting chief engineer, rapid transit commission. 
