| Helderberg Formation Stratigraphic range: Devonian | |
|---|---|
| Type | Formation |
| Location | |
| Country | United States |
| Extent | Maryland, Pennsylvania, West Virginia |
The Helderberg Formation is a geologic formation in Pennsylvania, Maryland and West Virginia. It preserves fossils dating back to the Devonian period.
The Monongahela Formation is a geologic formation in West Virginia, Pennsylvania, Ohio, and Maryland. It preserves fossils dating back to the Carboniferous and Permian periods.
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 Rockdale Run Formation is a geologic formation in Maryland, Pennsylvania, Virginia and West Virginia. It preserves fossils dating back to the Ordovician period.
The Sonyea Group is a geologic group in the northern part of the Appalachian Basin. It preserves fossils dating back to the Devonian period.
The Venango Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
The Cussewago Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
The Ithaca Formation is a geologic formation in Pennsylvania and New York (state). It preserves fossils dating back to the Devonian period.
The Canaseraga Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
The Cuba Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
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 Machias Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
The Rushford Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
The Gatesburg Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Cambrian period.
The Kinzers Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Cambrian Period.
The Tomstown Dolomite or Tomstown Formation is a geologic formation in Maryland, Pennsylvania, Virginia and West Virginia. It preserves fossils dating to the Cambrian Period.
The Vintage Dolomite is a geologic formation in Pennsylvania. It preserves fossils dating back to the Cambrian period.
The Anthracite Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Carboniferous period.
The Mercer Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Carboniferous period.
The Stonehenge Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Ordovician period.
The Genesee Group is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
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