CONTENTS. 
Page. 
Letter of Transmittal 7 
Part I. — Structural Studies 9 
Introduction _ 9 
Aids to geological studies on Manhattan Island 9 
Engineering enterprises that have pierced the rock floor 10 
Review of structural geological studies of the New York City area 12 
Boroughs of Manhattan and the Bronx '_ L2 
Gale 12 
Mather 12 
Cozzens 12 
Stevens 12 
Credner 13 
Newberry 13 
Dana 14 
Russell , 14 
Kemp 14 
Merrill 15 
Eckel 16 
Gratacap 16 
Julien . 17 
Peet 19 
Hobbs L9 
Area west of the Hudson 19 
Comment 20 
Scope of the present study 20 
Form of the rock pedestal of Manhattan 21 
Exposed portion of the rock basement 21 
Covered portion of the basement 22 
Transverse sections of the island 25 
Longitudinal sections of the island 26 
Along Broadway from the Battery to 33d street 26 
Along Lenox and Westchester avenues from 96th street to Mel- 
rose avenue 
Along Broadway and Eleventh avenue between 72d and Dyck- 
man streets 
2!) 
Part II.— Borings Made in New York and Vicinity 
Borings beneath channels on water front 
East River front 
Dock and bulkhead lines 
Miscellaneous - 
3 
