082 



REPORT OF NATIONAL MUSEUM, 1904. 

 Development of Geological Column — Continued. 



New York State survey, 1841-1843. 



Ansted, 1844. 



VIII. Quaternary system. 



VII. Tertiary system. 

 VI. New Red Sandstone. 

 V. Carboniferous system. 

 IV. Old Red Sandstone. 



/Erie division 



Helderberg 

 division. 



Ontario divi 

 sion. 



Champlain 

 division. 



Chemung group. 



Portage group. 



Genesee group. 



Tully limestone. 



Hamilton group. 



Mareellus shale. 



Corniferous lime- 

 stone. 



Onondaga lime- 

 stone. 



Schoharie grit. 



Cauda galli grit. 



Oriskany sand- 

 stone. 



Upper Pentamer- 

 ous limestone. 



Encrinal t lime- 

 stone. ' 



Delthyria shaly 

 limestone. 



Pentamerous lime- 

 stone. 



Waterlime group. 



Onondaga salt 

 group. 



Niagara group. 



Clinton group. 



Medina sandstone. 



Oneida, or Shaw- 

 angunk con- 

 glomerate. 



Gray sandstone. 



Hudson Ri ver 

 group. 



Utica slate. 



Trenton limestone. 



Black River lime- 

 stone. 



Caleiferous sand- 

 stone. 



Potsdam sand- 

 stone. 



II. Taeonic system 

 I. Primary or Hyj 



pogene system. 



Tertiary period 



Newer second- [Cretaceous 

 ary period, i tern. 



Middle second- 

 ary period. 



Wealden 

 tion. 



forma- 



Upper Oolitic sys- 

 tem. 



Middle Oolitic sys- 

 tem. 



Lower Oolite . 



Older second- 

 ary period. 



Newer Pal eo- 



zoic system. 



Older Paleozoic 

 system. 



its. I 



Newer Tertiary ori Tn1 

 Pliocene. ( 1UL 



MiddleTertiaryorlRed crag or coralline 



Miocene. J crag. 



Older Tertiary or|Bagshot sand. 

 Eocene. (London clay. 



Upper chalk. 



Lower chalk. 



Chalk marl. 



Upper Greensand. 



Gault. 



Lower Greensand. 



Wealden clay. 



Hastings sand. 



Purbeck beds. 



Portland stone. 



Portland sand. 



Kimmeridge clay. 



Upper calc grit. 



Coral rag. 



Lower calc grit. 



Oxford clay. 



Kelloway rock. 



Cornbrash. 



Forest marble. 



Great Oolite. 



Stonesfield slate. 



Inferior Oolite. 



Calcareous sand. 



Upper Lias shale. 



Lower Lias shale. 



Lower Lias limestone. 



Keuper. 



Muschelkalk. 



Bunter sandstein. 



Magnesian limestone. 



Lower New Red Sand- 

 stone. 



Upper coal grit. 



Coal Measures. 



Millstone grit. 



Carboniferous lime- 

 stone. 



Lower Carboniferous 

 shales. 



Slates and limestones 

 of Devonshire, con- 

 glomerates, corn- 

 stone, and tilestone. 



Ludlow and Wenlock 

 scries, and Upper 

 Cambrian and Cam- 

 brian rocks. 



Caradoc sandstone 

 and Llandeilo 

 flags, Older Cam- 

 brian and Cam- 

 brian fossil if erous 

 shales. 



Liassic group 



Upper New Red 

 Sandstone or Tri- 

 assic system. 



Magnesian lime- 

 stone or Permian 

 system. 



Carboniferous sys- 

 tem. 



Middle Paleo-pe™}ia>; Hgteni 

 zoic system. 1 or Old Red Sand 



stone. 



Upper 

 rocks. 



Lower 

 rocks. 



Silurian 



Silurian 



