58 ROCK FLOOR OF GREATER NEW YORK. [bull. 270. 
Summary of records of borings made in New York and vicinity — Continued. 
2. BORINGS IN THE BOROUGH <>F MANHATTAN— Continued. 
Serial 
num- 
ber. 
Location. 
Depth of boring to rock, 
As given. 
Referred 
to U. S. 
datum, 
Sandy 
Hook. 
Kind of rock, if known. 
639 
640 
(141 
642 
643 
644 
645 
646 
647 
648 
649 
650 
651 
652 
653 
654 
655 
656 
657 
658 
659 
660 
661 
662 
663 
664 
665 
On lint ofSSd street — Continued. 
Near Lexington avenue (wash).. 
Core 
I lalf block west ( core) 
Near Fourth avenue — ' 
LOO feel west of west line (core). 
Madison avenue i wash ) 
Core 
Fifth avenue, east line (wash)... 
Near First avenue | core) 
Halfway to Second avenue 
(wash i. 
Near Second avenue, east line 
(wash). 
West line (core) 
Halfway to Third avenue! wash i 
Third avenue, easl line ( core) . . . 
Bulkhead line (core i 
First avenue, east line 
Pierhead line 
On line of Sl,th street. 
Pierhead line I wash > 
First avenue, LOO feel east of east 
line i core |. 
West side. 75 feet south of south 
line 34th streel I core ). 
Along Fourth art nut .<> 
14th street 
15th street 
16th street 
17th street 
18th street 
19th street 
20th street 
21st street 
22d street 
20 
isf 
11 
41 
24 
26 
36 
13 
5 
24 
2 
1 
9 
96 
21 
L63 
141) 
32 
10 
Hi 
8 
K) 
15 
15 
10 
9 
17 
23 
h 
13 
43 
27 
38 
11 
3 
22 
4 
1 
11 
94 
19 
101 
138 
30 
( rheiss. 
Do. 
Do. 
Do. 
Rock or bowlder. 
( rneiss. 
Rock or bowlder. 
Do. 
( rneiss. 
Rock or bowlder. 
( rneiss. 
Do. 
Do. 
No rock. 
Rock or bowlder. 
( rneiss. 
Do. 
35 
Gneiss. 
35 
Do. 
30 
Do. 
25 
. Do. 
23 
Do. 
23 
Do. 
23 
Do. 
15 
Do. 
10 
Do. 
aGraether, L. F., Atlas of building laws of United States, New 
scaled irom section. Rock, gneiss interstratified with graniteand 
York. vol. 1, pi. 2. Depths (■ 
anthophyllite. 
