New York State Education Department 



New York State Museum 



John M. Clarke Director 



Bulletin 101 



PALEONTOLOGY 16 



GEOLOGY OF THE PENN YAN-HAMMONDSPORT 

 QUADRANGLES 



D. D. LUTHER 



All the formations represented on the area here considered 

 belong to the Devonic system and except for a very minor part 

 to the upper or Neodevonic division. 

 The following formations are present : 



Chemung sandstone and shale 



Chautauquan i 



Neodevonic ■{ Senecan 



Mesodevonic Erian 



Prattsburg shale 



High Point (Portage) sandstone 

 West Hill flags and shale 

 Grimes sandstone 

 Hatch shale and flags 

 Rhinestreet black shale 

 Cashaqua shale (including the 

 -j Parrish limestone) 

 Middlesex black shale 

 Standish shale 

 West River black shale 

 Genundewa limestone 

 Genesee black shale 

 Tully limestone 

 Moscow shale 



These are considered in order from bottom to top. 



