THE WORLD IN THE MAKING 



33 



Devonian period 

 Upper Devonian 

 Chautauquan series 

 Catskill sandstone 

 Chemung sandstone or 



shale 

 Senecan series 



Portage sandstone or 



shale 



Genessee shale 

 Tully limestone 

 ' Middle Devonian 

 Erian series 

 Hamilton shale 

 Marcellus shale 

 Ulsterian series 



Onondaga limestone 

 Schoharie grit 



Lower Devonian 



Oriskanian series 

 Esopus grit 

 Oriskany sandstone 



Helderbergian series 

 Becraft limestone 

 New Scotland limestone 

 Coeymans limestone 



Silurian period 



Upper Silurian (Cayugan) 

 Manlius limestone 

 Rondout limestone 

 Cobbleskill limestone 

 Salina beds 



Middle Silurian (Niagara) 

 Guelph dolomite 

 Lockport limestone 



Rochester shale 

 Clinton beds 



Mountain Glenn shale 

 Alto 'formation 



Lingle limestone 

 Misenheimer shale 



Grandtower limestone 

 Dutch Creek sandstone 

 Clear Creek chert 



Backbone limestone 

 Bailey limestone 



Monroe series, Mich. 



Guelph dolomite 

 Reef limestone 

 Upper coral beds 

 Lower coral beds 

 Sexton Creek 

 Edgewood 



