The DunleithFormation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. Earth sciences portal Illinois portal...
Kinkaid formation to the west. Mt. Pleasant Sandstone, Bristow Sandstone, and Siberia Limestone. The Siberia is a thin tongue of the Menard formation. This...
The Knox Supergroup, also known as the Knox Group and the Knox Formation, is a widespread geologic group in the Southeastern United States. The age is...
use. The Petersburg formation also contains sandstone members that are used as aquifers. The Linton Formation is a geologic formation in Indiana. It is...
quartz pebbles, as well as a matrix of quartz sand. The Wilcox Formation is a sand formation that is part of the Embayment Megagroup. It runs from southern...
The Munising Group or Formation is a 1,700 feet (520 m) thick, white to light grey Cambrian sedimentary unit that crops out in Michigan and (to a lesser...
The Hunton Megagroup also Hunton Super Group, Hunton Group, Hunton Formation and Hunton Limestone is predominantly composed of carbonate rock, deposited...
Harmony Group is located in the State of Indiana. It is made up of three formations, the Grassy Knob Chert, the Backbone Limestone and Clear Creek Chert....
underlies the Antrim Shale. The North Vernon Limestone is a geologic formation in Indiana. Also called the Sellersburg Limestone, this term however is...
The Paoli Formation, Paoli Limestone, or Paoli Chert is a geologic formation in Indiana, Illinois, Kentucky and Missouri. This formation contains members...
The Salem Formation is a geologic formation in Illinois, Indiana, Kentucky, and Missouri. It preserves fossils dating back to the Mississippian subperiod...
The Golconda Formation is a geologic formation in Kentucky. It preserves fossils dating back to the Carboniferous period. In Indiana, the Golconda, it...
The Patoka Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. List of fossiliferous stratigraphic...
cliffs have been cut into the resistant dolostone of the Ordovician Dunleithformation by rivers. Apple River Canyon State Park shows some of this dramatic...
The Quimbys Mill Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. Earth sciences portal Illinois...
The Wise Lake Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. Earth sciences portal Illinois...
The Warsaw Formation is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian subperiod. Paleontology...
The Glenwood Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. Earth sciences portal Illinois...
The Leemon Formation is a geologic formation in Missouri. It preserves fossils dating back to the Ordovician period. Earth sciences portal United States...
Galena Group Type Group Sub-units Decorah Shale, DunleithFormation, Wise Lake Formation, Dubuque Formation Underlies Maquoketa Group Overlies Platteville...
The Mattoon Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. List of fossiliferous stratigraphic...
The Paint Creek Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. Earth sciences portal Illinois...
The Nachusa Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. Earth sciences portal Illinois portal...
The Dubuque Formation is a geologic formation in Illinois, Iowa, Wisconsin and Minnesota. It preserves fossils dating back to the Ordovician period. List...
The Bond Formation is a geologic formation in Illinois, Kentucky and Indiana. It preserves fossils dating back to the Carboniferous period. List of fossiliferous...
The Keokuk Limestone is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian sub-period. Paleontology...
The Pecatonica Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. List of fossiliferous stratigraphic...