BERKEY, GEOLOGY OF SOUTHERN MANHATTAN ISLAND 
261 
e) Fourteenth St. (New York) to North 7th St. {Brooklyn), across East River. 
Serial No. 
Original 
Mark 
Location 
Depth 
to rock 
M. H. W. 
To Rock 
U. S. 
datum 
Rock 
penetra¬ 
tion 
Form¬ 
ation 
Variety and remarks 
19 
3460 
50' E. of pier 
headline 
-53.0' 
-49.28' 
11.0' 
Drift. 
No ledge. Trap bowlder, 
etc. 
20 
3461 
450' E. ditto 
-72.0' 
-69.28' 
15.0' 
Ford. 
Granitic gneiss coarser 
and more garnetiferous 
than usual. 
21 
3462 
800' E. ditto 
-62.0' 
-59.28' 
11.0' 
“ ? 
Garnetiferous granitic 
gneiss, core 10 ft. (same). 
22 
3463 
1150' E. ditto 
-65.0' 
-62.28' 
12.0' 
“ ? 
Granitic gneiss, core 11' 
(same). 
23 
3464 
1600' 4- E. ditto 
-57.0' 
-54.28' 
10.0' 
Manh. 
Mica schist and pegma¬ 
tite, 9'. 
24 
25 
3465 
3466 
2100'+ E. ditto 
2250' E. ditto 
-86.0' 
-83.28' 
8.0' 
, 
Garnetiferous 7 ft. 
No rock at -120.51'. 
f) 84th St. (New York) to L. 1. City R. R. Station, across East River. 
26 
3467 
525' E. of 35th 
St. pier end 
-72.0' 
-69.28' 
11.0' 
Manh. 
Mica schist, finer than 
usual, dip 50°. 
27 
3468 
575'+ E. ditto 
-59.0' 
-56.28' 
8.0' 
Ford. 
Banded granitic gneiss, 
dip 65°. 
28 
3469 
800' E. ditto 
-64.0' 
-61.28' 
13.0' 
Micaceous granitic gneiss 
dip 45-50°. 
29 
3470 
1000' E. ditto 
-54.0' 
-51.28' 
9.0' 
Manh. 
Mica schist, dip 45°. 
30 
3471 
1240' E. ditto 
-74.0' 
-71.28' 
10.0' 
‘ 
Mica schist garnetiferous 
and fine grain, flat. 
31 
3472 
L. I. City pier 
headline 
-52.0' 
-49.28' 
11.0' 
Mica schist, finer grain 
than usual. 
32 
3473 
Front St. L. I. 
City 
-38.0' 
-35.23' 
2.0' 
Ford. ? 
Rather coarse mottled 
granitic gneiss. 
New York and Long Island Railroad Company 
Belmont Tunnel 
This company has completed a tunnel across the East River from 
Forty-second Street to Long Island City, known as the “Belmont Tunnel.” 
Numerous wash borings and several diamond drill borings were made. 
The figures for depth and rock penetration are taken from the drawings of 
the company. The datum is mean high water and is the same as the 
M. H. W. datum of the Rapid Transit Commission, 2.72 feet above mean 
sea level at Sandy Hook. The depths to rock have been corrected, there- 
