The Devonian Old Port Formation is a mapped bedrock unit in Pennsylvania, USA. Details of the type section and of stratigraphic nomenclature for this unit as used by the U.S. Geological Survey are available on-line at the National Geologic Map Database. Current nomenclature usage by U.S. Geological Survey restricts the name Old Port Formation to Pennsylvania, but correlative units are present in adjacent states.
The Williamsport Sandstone is a sandstone geologic formation in West Virginia, Virginia, Pennsylvania, and Maryland. The formation includes the Cedar Creek Limestone member. Near Cumberland, Maryland it includes the Cedar Creek Limestone member. It preserves fossils dating back to the Silurian period.
The Freeport Formation is a geologic formation in Pennsylvania and Ohio. It preserves fossils dating back to the Late Pennsylvanian period. It is within the Allegheny Group.
The Oranda Formation is a geologic formation in Virginia. It preserves fossils dating back to the Ordovician period.
The Talbot Formation is a geologic formation in Maryland. It preserves fossils dating back to the Neogene period.
The Cuba Formation is a geologic formation in New York (state) and Pennsylvania. It preserves fossils dating back to the Famennian age.
The Java Formation is a geologic formation in Kentucky, New York, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia. It preserves fossils dating back to the Devonian period. The formation comprises the Pipe Creek Shale, Wiscoy Sandstone Member in New York, and Hanover Shale Member except in Tennessee.
The Kinzers Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Cambrian Period.
The Cape May Formation is a geologic formation in New Jersey and Pennsylvania. It preserves fossils.
The Tallahatta Formation is a geologic formation found on the surface in Alabama, Florida, Georgia, and Mississippi. It is also located in the subsurface of Kentucky. The Tallahatta formation is part of the Claiborne Group and contains four members: the Basic City Shale in Mississippi, the Holy Springs Sand Member in Mississippi, the Meridian Sand Member in Alabama and Mississippi, and the Neshoba Sand Member in Mississippi. It preserves fossils dating back to the Paleogene period, specifically the Eocene.
The West Castleton Formation is a geologic formation in New York and Vermont. It preserves fossils dating back to the Cambrian period.
The Bois d'Arc Formation is a geologic formation in Oklahoma. It preserves fossils dating back to the Devonian period.
The Gunsight Limestone Member is a geologic member in Texas. It preserves fossils.
The Belle Fourche Formation or Belle Fourche Shale is a fossiliferous early Late-Cretaceous geologic formation classification in Wyoming. Named for outcrops in Belle Fourche River, Wyoming, this unit name is also used in Montana, North Dakota, and South Dakota.
The Denay Limestone is a geologic formation in Nevada. It preserves fossils dating back to the Devonian period. It is located in the Denay Valley, which lies between the Simpson Park Mountains and the Roberts Mountains.
The Coils Creek Limestone is a geologic formation in Nevada. It preserves fossils dating back to the Devonian period.
The Sunflower Formation is a geologic formation in Nevada. It preserves fossils dating back to the Permian period.
The Vaquero Formation is a geologic formation in California. It preserves fossils dating back to the Neogene period.
The La Jolla Group is a group of geologic formations in coastal southwestern San Diego County, Southern California. Its locations include the coastal La Jolla San Diego region.
The Santa Susana Formation is a Paleogene period geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.
Pennsylvania, 
New York, 
West Virginia, 
Virginia, 
Ohio [4] 
United States 
