44 
ROCK FLOOR OF GRFATER NFW YORK. 
[bull. 27$ 
Summary of records of borings made in New York and vicinity — Continued. 
1. BORINGS BENEATH CHANNELS ON WATER FRONT Continued^ 
Location. 
Depth of boring lt» rock. 
Kind of rook, 
Serial 
num- 
ber. 
As given. 
Referred 
to U. S. 
datum, 
Sandy 
Hook. 
if known. 
318 
319 
HARLEM RIVER FRONT AND SEC- 
TIONS — continued. 
Madison avenut bridge, a 
First pier from New York side. . . 
Central pier 
-75 
-71. 7 
-57. 5 
- 73 
- 69 
- 55 
+ 20 
50 
104 
70 
+ 20 
4!) 
— 41 
No rock. 
Do. 
Do. 
Gneiss. 
Rock or bo 
Do. 
NO lock. 
( Jneiss. 
( ineiss. 
No rock. 
Do. 
Do. 
Limestone. 
320 
321 
Pier at north end 
Park avt nue bridge. & 
West shore . . 
322 
South shore (in river) 
wider. 
323 
Central pier 
324 
Pier near Bronx shore 
325 
50 feet north of above 
326 
Third avenue bridgt ,c 
South rest pier 
327 
Second avt nut bridgt . d 
South pier 
328 
Central pier 
45 
329 
North bulkhead line 
- 40 
- 78 
330 
Willis avt nut bridgt . r 
Center pier 
2. BORINGS IN THE BOROUGH OF MANHATTAN. 
Lint of subway, on or near Broadway. e 
Whitehall street — 
331 
North line of South street 
Battery Park- 
-22.2 
-16 
Gneiss. 
332 
Southeast corner Whitehall 
street. 
-15 
— 7 
Do. 
333 
About 200 feet southwest of 332. 
-12.5 
- 4 
Do. 
334 
450 feet west of 332 and 200 feet 
south of State street. 
-32 
-22 
Do. 
"Boiler, A. P., consulting engineer, and Eugene McLean, engineer of comptroller's office. 
i> Boiler, a. P., consulting engineer. 
'■Byrne, E. A., assistant city engineer, New York, other piers of Third avenue bridge at same 
depth as 326 rest upon bowlders, 
''('roes, J. J. r., chief engineer. 
f Rice, Ceo. s., acting chief engineer, rapid transit com mission. Wash borings. 
