96 
INDEX. 
Page. 
Manhattan Island, channels around, bor- 
ings in 30 11 
engineering enterprises on 10 
geology of, study of 9-29 
mapso'f 15,20,22,24 
discussion of 9-10 
sections of 25-29 
figures showing 25, 26, 28 
structure of 9-29 
water front of, bed rock on 30-44 
Manhattan viaduct, bed rock at 66-67 
Mather, \V. \\'., on New York City geology. 12 
Merrill, F. J. H., on New York City geology. 15-16 
Newberry, J. S., on New York City geology. 13-14 
Ninth avenue, bed rock near 55 57, 81 
New York-Brooklyn tunnel, bed rock in. . . 35 
New York Central Railroad bridge, section 
of Harlem Riverat. bed rock in. 43 
One hundred and forty-fifth street bridge, 
section of Harlem River at, bed 
rock in 43 
One hundred and tenth street, bed rock on . (8 
Pane avenue, bed rock on and near 80 
Park avenue bridge, section of Harlem Riv- 
er at, bed rock in 11 
Pennsylvania, New York and Long Island 
Railroad Company, borings of, 
bed rock iu 25 26 
tunnel of, bed rock in 40-41 
Pennsylvania Railroad, tunnel of, bed rock 
in 34-35 
Peet, C. E., on New York City geology 19 
Queens, Borough of, bed rock in 86-87 
Randall's map, character of 9 
Rapid transit commission, subway of, bed 
rock in 26-29, 44-49 
tunnels of 10 
bed rock in 35,43 
Page. 
Riverside Park extension, bed rock on 59-66 
Riverside viaduct, bed rock at 66 
Rock basement. See Bed rock. 
Russell, I. C, on New York City geology. . . 14 
School buildings, foundations of, bed rock 
in 71-76 
s.cond avenue, bed rock on and near 57-58, 
69, 73-74 
Second avenue bridge, section of Harlem 
River at, bed rock in 44 
Sections, location of, map showing 24 
Seventh avenue, bed rock near 56-57, 81 
Sixth avenue, bed rock near 56-57, 68, 70 
Southern boulevard, bed rock on N7-88 
Spuyten luiyvil bridge, section of Harlem 
River at, bed rock in 41 
Stevens, R. P. , on New York City geology ... 12-13 
Stock Exchange building, bed rock at, map 
showing li 
Tenth avenue, bedrock near 56, 67,7r>,x<>-8l 
Thin] avenue, bedrock near 58,69,74,79,82 
Third Avenue bridge, section of Barlem 
I ; i ver at, bed rock in 44 
Tbirty-first street, bed rock on line of 55 
Thirty-fourth street, bed rock on line of. 48-49,58 
Thirty-second street, bed rock on line of... 55-57 
Thirty-third street, bed rock on line of 57-58 
Tu el ftli avenue, bed rock near 55,59-66 
Viele, E. <;.. map of, character of 9 
Wadsworth avenue, foundations on, bed 
rock in 71 
Washington Bridge, section of Harlem River 
at, bed rock in 12 
Weehawken, N. J., bed rock in 93 
Westchester avenue, bed rock on 87-88 
section along, figure showing 28 
Willis avenue bridge, section of Harlem 
River at, bed rock in 
