76 
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 OF MANHATTAN— Continued. 
Location. 
Depth of boring to rock. 
As given. 
Referred 
to U. S. 
datum, 
Sandy 
Hook. 
Kind of rock, if known. 
Miscellaneous— Foun dation s for school 
buildings— Continue 1 . 
168th street, corner Audubon 
avenue. " 
60 feet west of 1111 
169th street, corner Audubon 
avenue. 
60 feet west of 1113 . 
Near Amsterdam avenue h — 
300 feet west on 108th street... 
500 feet west on 108th street. . . 
300 feet west on 109th street. . . 
500 feet west on 109th street... 
100 feet west and 100 feet north 
of 1115. 
Miscellaneous— Approach to East River 
bridge No. 2. c 
Tompkins street — 
Corner Delancey (D) 
90 feet south of south line De- 
lancey street ( H ) . 
Delancey street, southeast cor- 
ner Mangin (C). 
Center line of bridge — 
70 feet west of west line of 
Mangin street (A). 
West line of Cannon street ( B ) . 
West line of Columbia street (C ) 
West line of Sheriff street (H) . 
West line of Willett street (E-I) 
West line of Pitt street (G) 
Miscellaneous— Records not classified. 
Near Trinity Church, Broadway, 
facing Wall street."' 
Washington street, between Ful- 
ton and Vesey. 
-11 
-20. 08 
-12. 58 
12.58 
-21.66 
-12.66 
- 5. 75 
- 5.91 
- 7.91 
-69.5 
95. 1 
-70. 8 
—61. 16 
-56. 25 
-62. 66 
-51 . 58 
-51.50 
-56. 08 
-26 
-70 
86 
95 
L02 
102 
100 
- 67 
- 93 
- 68 
- 59 
— 54 
60 
49 
49 
54 
11 
- 60 
Gneiss. ' 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Supposed to ha 
reached rock. 
« Datum of Nos. 1111-1115 is point on curb corner Audnbon avenue and 169th street. 
t vJ? Nos ' 1116 ~ 1120 is P ()] ' n t on 109th street curb 300 feet west of Amsterdam avenue 
c La Uucotte, H. A., chief engineer. Datum, menu high water. 
d Nos. 1129-1144, I.C.Russell, Annals New York Aead.Sei., vol. 2, 1882, pp. 66-77. 
