TABULAR SECTION OF FORMATIONS. 
Periods. 3?ig. 1, Epochs. 
Permian. 
Upper 
Coal Measures. 
Lower 
Coal Measures. 
Millstone Grit. 
Upper. 
Lower. 
Catskill. 
Chemung. 
Portage. 
Genesee. 
Hamilton. 
Marcellus. 
Up. Held. Limestone 
Schoharie. 
Cauda-Galli. 
Oriskany. 
Lower Helderberg. 
Onondaga Salt. 
Niagara. 
Clinton. 
Medina. 
Hudson River. 
Utica. 
Trenton. 
Chazy. 
Quebec. 
Calciferous. 
Potsdam. 
Acadian. 
Archaean. 
