ILLUSTRATIONS 
Page 
Plate. I. Map of the southern portion of Manhattan Island, with portions of 
the Long Island and New Jersey shores, showing the configuration 
of the rock floor 20 
II. Map of northern and eastern portions of Manhattan Island, showing 
the configuration of the rock floor 22 
III. Sketch map of Manhattan Island, showing the location of some of the 
river sections 24 
IV. Series of profiles across the Harlem River, showing the position and 
configuration of the rock surface 26 
V. Section of the rock basement of Manhattan along the line of Broad- 
way from the Battery to 33d street 28 
Fio. 1. Rock surface beneath the new Stock Exchange building, between New 
and Broad streets 11 
2. Sketch map of Manhattan Island (after Kemp) 15 
3. Sketch map of Manhattan Island, showing location of special transverse 
and longitudinal sections 24 
4. Transverse sections across Manhattan Island between 31st and 34th 
streets 25 
5. Section along Lenox and Westchester avenues from 96th street, Man- 
hattan, to Melrose avenue, Bronx 28 
6. Section along Broadway and Eleventh avenue from 72d street to Dyck- 
man street 28 
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