The St. Laurent Formation is a geologic formation in Illinois. It preserves fossils dating back to the Devonian period. Earth sciences portal Illinois...

northernmost reaches where it grades in to the Joliet and Racine Formations it is about 150' thick. The St. Clair is composed of course calcite grains to fine grains...

use. The Petersburg formation also contains sandstone members that are used as aquifers. The Linton Formation is a geologic formation in Indiana. It is...

underlies the Antrim Shale. The North Vernon Limestone is a geologic formation in Indiana. Also called the Sellersburg Limestone, this term however is...

is still commonly known as Ville Saint-Laurent (City of Saint-Laurent) or by its initials, VSL. Saint-Laurent is the largest of Montreal's boroughs by...

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 St. Lawrence River (French: Fleuve Saint-Laurent) is a large international river in the middle latitudes of North America connecting the Great Lakes...

The St. Peter Sandstone is an Ordovician geological formation. It belongs to the Chazyan stage of the Champlainian series in North American regional stratigraphy...

Unconformities separate this formation from the underlying Powell Formation and the overlying St. Peter Sandstone Formation. The Everton Formation is composed primarily...

The Paoli Formation, Paoli Limestone, or Paoli Chert is a geologic formation in Indiana, Illinois, Kentucky and Missouri. This formation contains members...