New York State Education Department 



New York State Museum 



John M. Clarke, Director 



Bulletin 114 

 PALEONTOLOGY 1 7 



GEOLOGIC MAP 



OF THE 



ROCHESTER AND ONTARIO BEACH QUADRANGLES 



BY 



C. A. HARTNAGEL 



INTRODUCTION 



The area covered by this map is one long known in New York 

 geology. As early as 1824, Prof. Amos Eaton ^ had given a brief 

 account of the geology of this region. Later, in the days of the 

 original survey of the fourth district, Prof. James Hall carefully 

 exploited the geology of Monroe county, and through the long inter- 

 vening years his report has served as a standard for the general 

 geology of the region. 



In carrying on the investigations for the present work, I have had 

 the cordial cooperation of local geologists to whom I desire to express 

 my appreciation and thanks. Prof. H. L. Fairchild has contributed 

 information relative to the drift-covered area found in the southern 

 part of the map and has given suggestions in regard to the units of 

 sedimentation which have been used on the map. Prof. A. L. Arey 

 has contributed a map on which were recorded rock excavations 

 which are no longer accessible. This has been an aid in determin- 

 ing the contact lines within the city limits. Mr G. H. Chadwick 

 directed my attention to numerous outcrops which were indicated 

 on a topographic sheet submitted for my use. 



I Geological and Agricultural Survey of the District Adjoining the Erie Canal. 



