| Rockdale Run Formation | |
|---|---|
| Stratigraphic range: Lower Ordovician | |
 Rockdale Run Formation in Skyline Caverns, Virginia | |
| Type | Formation |
| Unit of | Beekmantown Group |
| Underlies | Pinesburg Station Dolomite |
| Overlies | Stonehenge Limestone |
| Thickness | 2450 ft [1] |
| Lithology | |
| Primary | Limestone |
| Other | dolomite, chert |
| Location | |
| Region | Maryland, Pennsylvania, Virginia [2] and West Virginia |
| Country | United States |
The Rockdale Run Formation is a geologic formation in Maryland, Pennsylvania, Virginia and West Virginia. [1] It preserves fossils dating back to the Ordovician period.
