Published monthly by the 



New York State Education Department 



BULLETIN 409 



AUGUST 1907 



New York State Museum 



John M. Clarke, Director 



Bulletin 114 

 PALEONTOLOGY 17 



GEOLOGIC MAP 



OF THE 



ROCHESTER AND ONTARIO BEACH 

 QUADRANGLES 



BY 



C. A. HARTNAGEL 



PAGE 



Introduction 5 



Sequence of events preceding 

 the deposition of the rocks of 

 the Rochester area 8 



Formations < 10 



PAGE 



Medina formation 10 



CHnton formation 12 



Niagara formation 17 



Sahna formation 2'j 



Index 33 



