74 
ROCK FLOOR OF GREATER NEW YORK. 
[BI'LL.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. 
Serial 
num- 
ber. 
As given. 
Referred 
to U. S. 
datum, 
Sandy 
Hook. 
Kind of rock, if known. 
Miscellaneotis— Foundations for school 
buildings— Continued. 
101st street «— 
1068 
350 feet west of Amsterdam 
avenue. 
-33. 33 
66 
"Gneiss.'' 
1069 
225 feet west of Amsterdam 
avenue. 
102d street— 
-18. 50 
80 
Do. 
1070 
200 feet west of Amsterdam 
avenue. 
- 9.75 
91 
Do. 
1071 
350 feet west of Amsterdam 
avenue. 
-24. 08 
76 
Do. 
1072 
100 feet north and 50 feet west of 
1069. 
-21. 75 
77 
Do. 
1073 
Avenue A and 77th street b 
- 5 
26 
"Granite." 
1074 
Avenue A and 78th street 
34 
Do. 
1075 
138 feet east of 1073 
— 4.91 
21 i 
Do. 
1076 
138 feet east of 1074 
— 3.66 
30 
Do. 
Tilth street — 
1077 
105 feet east of Third avenue c . 
-18. 83 
32 
Do. 
1078 
205 feet east of Third avenue . . 
-35. 83 
15 
Do. 
1079 
68 feet south of 1077 
-34. 25 
17 
Do. 
1080 
68 feet south of 1078 
—40. 58 
10 
Do. 
1081 
31 feet south and 50 feet east of 
1077. 
36.91 
14 
Do. 
1082 
66th street, 163 feet east of First 
—12.58 
32 
11 ( Iranite." 
avenue.^ 
1083 
313 feet east of First avenue . . . 
—17. 16 
28 
Do. 
1084 
67th street, 163 feet east of First 
avenue. 
- 8 
40 
Do. 
1085 
313 feet east of First avenue . . . 
-12.75 
35 
Do. 
1086 
238 feet east of Second avenue and 
100 feet north of 66th street. 
66th street e— 
—14 
45 
Do. 
1087 
225 feet east of Amsterdam 
avenue. 
(». m 
56 
"Gneiss." 
1088 
325 feet east of Amsterdam 
avenue. 
s. 66 
54 
Do. 
a Datum of Nos. 1068-1072 is point on 102d street 
& Datum of Nos. 1073-1070 is point on curl) corne 
c Datum of Nos. 1077-1081 is point on curb 105 ft 
<2 Datum of Nos. 1082-1086 is point on 67th street 
« Datum of Nos. 1087-1091 is point on 66th street 
curb 350 feel west of Amsterdam avenue. 
r Avenue A and 77th street. 
el east of Third avenue. 
curb L63 feet east of First avenue. 
curb 325 feet east of Amsterdam avenue. 
