DETAILED RECOEDS. 
Geologic nomenclature for sedimentary rocks. 
183 
System. 
Series. 
Groups and formations. 
Quaternary 
Tertiary. 
Recent 
Pleistocene 
Pliocene 
Miocene 
Oligocene.. 
Eocene 
Gulf. 
Cretaceous. 
Comanche. 
Jurassic. 
Triassic. 
Carboniferous . 
Permian 
Pennsylvania!! . 
Mississippian.. 
Devonian. 
Silurian . 
Ordovician. 
Cambrian. 
Algonkian . 
Archean . . . 
Saratogan. 
Acadian . . . 
Georgian . . 
South Atlantic and Gulf Coastal Plain. 
►Columbia loam and gravel. 
Lafayette gravel. 
Shell Creek limestone. 
Caloosahatchee limestone. 
Oakville group. 
Pascagoula group. 
Chesapeake sands. 
("Oak Grove marl. 
IChipola sand. 
Chattahoochee group. 
[Vicksburg group. 
(Jackson group. 
Cockfleld group. 
Claiborne group. 
Wilcox group. 
(Midway group. 
Texas and Great Plains region. 
Montana group. 
Colorado group. 
Dakota group. 
Washita group. 
Fredericksburg group. 
Trinity sand. 
North Atlantic Coastal Plain. 
Arundel sands. 
Patuxent clays. 
Brunswick sandstone. 
Lockatong shale. 
Stockton sandstone. 
New York- Pennsylvania region. 
Dunkard sandstone. 
iMonongahela formation. 
Conemaugh formation. 
Allegheny formation. 
Pottsville conglomerate. 
fMauch Chunk shale. 
\Pocono sandstone. 
Chemung sandstone. 
Portage sandstone. 
Hamilton shale. 
Marcellus shale. 
Onondaga limestone. 
Schoharie grits. 
Oriskany sandstone. 
[Helderberg limestone. 
Salina formation. 
Niagara group. 
Clinton shale. 
[Medina sandstone. 
(Eden-Lorraine shale\ n d 
Utica shale. j nuason group. 
Trenton limestone. 
Chazy limestone. 
[Beekmantown limestone. 
Potsdam sandstone. 
Braintree slate. 
Chickies quartzite. 
