Bulletin No. 270 Series B, Descriptive Geology, 73 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES D. WALCOTT. Director 
THE 
CONFIGURATION OF THE 
ROCK FLOOR OF 
GREATER NEW YORK 
BY 
WILLIAM HERBERT HOBBS 
rnlleae Library 
>rnment ru 
■"»VC1 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
19 5 
