pq Quaternary 



llJer Pliocene 

 \liortni' 



iNtw Ked sandstone 



Mngnesian liuii 

 CarlKiniferous 



Old Bed sandstone 



Carboniferous 



Helderberg 

 Ontario 

 Champloin 

 Taconic 



Tertiary or Cenozoic aeries 

 (witli seven subdivisions) 



Ludlow 



Wenlock 



Caradoc 



Llandeilo 



Festiniog 



Bangor 



Recent 

 Pleistocene 

 Pliocene 

 Miocene 



Carboniferous 



Dana, 1862 



Age of Man 

 Post-Tertiary 



Tertiary 



{Recent 



Pleistocene 

 Pliocene 

 Miocene 

 Oligocene 

 Eocene 



Carboniferous ■{ Pennsylvaniar 

 l^ Mississippian 



Algonkiai 

 Archean 



Miocene 

 Eocene 



Triassic 



Permian 



Pennsylvan 



Mississippit 



Devonian 



Proterozoic 

 Archeozoic 



Tennesseic 

 Mississippic 

 Devonic 



Cincinnatic 



Ordovieic 



Canadic 



Ozarkic or Cambric 



Acadic 



Proterozoic 

 Archeozoic 



: system with 28 formational units. 



VELOPMENT OF GEOLOGICAL ( 



AND OF STRATIGRAPHIC NOMENCLATURE FROM 1837 1 



