42 
GEOLOGICAL SURVEY 
NEWER SECONDARY PERIOD. 
Systems, Formations, and | Localities of characteristic | European Equivalents and 
) 
: 
Groups. deposits in America. Localities. 
Cretaceous System. 
’ Upper chalk, (with Maestricht beds. 
flints.) 
Lower chalk, (without 
flints.) 
Chalk Marl. Craie tufau. 
Upper Greensand. New Jersey. 
Gault. South Carolina. 
Lower Greensand. Alabama. Neocomien. 
MIDDLE SECONDARY PERIOD. 
Wealden Formation. | 
Weald clay. Portland. 
Purbeck beds. 
Oolite System. 
Portland stone. 
Kimmeridge clay. 
Forest marble. 
Great Oolite. 
PARA AAR AAA Rey 
Oxford, Bath. 
Jura chain. 
Inferior Oolite. Virginia ? 
Lias Group. 
Upper Lias. Lyme regis. 
Lower Lias limestone. Whitby. 
Surrey, Kent « Sussex. | 
OLDER SECONDARY PERIOD. 
Upper New Red, or 
Triassic System. 
Saliferous, or New Red 
Sandstone. 
Red Sandstones and 
Conglomerates. 
Keuper. 
Massachusetts. Muschelkalk. 
Connecticut. Bunter sandstone. 
Virginia. (Gres bigarre.) 
N. and §. Carolina. 
NEWER PALZOZOIC PERIOD. 
Magnesian Limestone, 
or Permian System. 
Magnesian Limestone. 
Lower New Red. 
Carboniferous System. 
’ Coal Measures. 
: Millstone grit. 
: Carboniferous, or 
Mountain Limestone. 
’ Lower Carboniferous 
Shales. 
Permia, Russia, 
Zechstein. 
Rothe-todte-liegende. 
Pennsylvania. Coal Measures of the 
Virginia. North of England. 
Ohio. 
Alabama. 
MIDDLE PALAOZOIC PERIOD. 
+ Devonian System, or 
Old Red Sandstone. 
Yellow quartzose sand- 
stone. 
Flagstones. 
Limestones. 
Conglomerates. 
New York. 
Pennsylvania. Devonshire. 
hio. 
Michigan. 
