The Rockdale Run Formation is a geologic formation in Maryland, Pennsylvania, Virginia and West Virginia.Geologic Unit: Rockdale Run, USGS It preserves fossils dating back to the Ordovician period.
See also
List of fossiliferous stratigraphic units in Maryland List of fossiliferous stratigraphic units in Pennsylvania List of fossiliferous stratigraphic units in Virginia List of fossiliferous stratigraphic units in West Virginia
References