Education Department Bulletin 



Published fortnightly by the University of the State of New York 



Entered as second-class matter June 24, 1Q08, at the Post Office at Albany, N. Y., under the 



act of July 16, i8g4 



No. 492 ALBANY, N. Y. April i, 1911 



New York State Museum 



John M. Clarke, Director 



Museum Bulletin 148 



GEOLOGY OF THE POUGHKEEPSIE QUADRANGLE 



BY 



CLARENCE E. GORDON 



INTRODUCTION 



The preparation of this paper was begun at the suggestion of 

 Professor J. F. Kemp. The field work was carried on at intervals 

 during the summers of 1906-7-8-9. During the intervening win- 

 ters the extensive literature dealing with the geology of eastern 

 New York State, western New England and the areas of similar 

 rocks at the south was read with care. 



A preliminary map of the quadrangle was prepared by a sum- 

 mer school party of Columbia University at work for a week under 

 the direction of Professor Kemp, Professor A. W. Grabau and Dr 

 C. P. Berkey. This was of great assistance in the field. 



The writer owes much to Professor Kemp for kindly criticism. 

 Dr Charles P. Berkey has offered important suggestions. Par- 

 ticular thanks are due Professor John M. Clarke for a generous 

 interest which has made some of the field work easier of execution. 



