FIRST ANNUAL REPORT, 1889. PLATE III. 





)RMATIONS. 









1 their probable correlations, as determined to January 1, 1890. 









Division. 



Series. 



System. 



Group (Era). 







Champlain. 



QUATERNARY. 





tes. 



Is, and Lignites. 





Miocene. 

 Eocene 



TERTIARY. 



CENOZOIC. 





FOX Mil 



Pierre. 

 Niobrara. 

 Benton. 

 Dakota. 



Upper Cretaceous. 



CRETACEOUS. 







Potomac. 



Lower Cretaceous. 





MESOZOIC. 



erate. 







JURASSIC. 

 TRIASSIC. 





am. 



and Gypsum. 



s. 







PERMIAN. 





, Coal. 





Coal Measures, 

 subcarboniferous. 



NlAGARAN. 



CARBONIFEROUS. 



DEVONIAN 

 UPPER SILURIAN. 







Hudson. 

 Birdseye, etc. 



Trenton. 





PALEO C 



oestones. 



Ghazy. 



Middle Canadian. 



Lower Canadian. 



y Canadian. 



LOWER SILURIAN. 





us Conglomerate, 

 le. 





Potsdam. 



Middle Cambrian. 

 Lower Cambrian. 



CAMBRIAN. 





5. 



te, with Eruptives. 

 ts. 







ALGONKIAN? 



EPAB.CH.aSAN. 



es. 







ONTARIAN? 



ABCH^AN. 



t. 



ne Schist. 







LAURENTIAN? 





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