"NfiW YdRK STATE MUSEUM 



Devonic 



Senecan 



Erian 



Ulsterian 



Ontario Cayugan 

 or Siluric 



Chemung shale and sand- 

 stone 



Wiscoy shale 

 Nunda sandstone 

 Gardeau flags and shale 

 Grimes sandstone 

 Hatch shale and flags 

 Rhinestreet black shale 

 Cashaqua shale 

 Middlesex black shale 

 West River shale 

 Genundewa limestone 

 Genesee black shale 

 v. Pyrite layer. Tully horizon 



'Moscow shale 

 Tichenor limestone 

 Ludlowville shale 

 Skaneateles shale 

 Cardiff shale 

 Stafford limestone 

 Marcellus black shale 



Onondaga limestone 



Oriskanian Oriskany sandstone 



f Bertie waterlime 

 (^ Camillas shale 



FORMATIONS IN ASCENDING ORDER 



ONTARIO OR SILURIC 



CAMILLUS SHALE 



The drift hills on the northern border of the Honeoye quadrangle 

 rest upon thin magnesian limestones and soft gypseous shales 

 belonging to this formation, which receives its name from the town 

 of Camillus, Onondaga county, where the first discovery of gypsum 

 in the United States was made in the year 1792, and where the beds 

 of this formation are abundantly exposed. 



