Juniata Formation

Juniata Formation
Stratigraphic range: Late Ordovician
Outcrop on U.S. Route 522 at Blacklog Narrows southeast of Orbisonia, Pennsylvania.
Typesedimentary
UnderliesOswego Formation and Tuscarora Formation
OverliesBald Eagle Formation
Thickness400–1,125 ft (122–343 m)
Lithology
Primarysandstone, siltstone, shale
Location
RegionAppalachian Mountains
ExtentMaryland, Pennsylvania, Tennessee, Virginia,[1] and West Virginia
Type section
Named forJuniata River in Pennsylvania
Named byDarton and Taff[2]

The Ordovician Juniata Formation is a mapped bedrock unit in Pennsylvania, West Virginia, Virginia, Tennessee, and Maryland. It is a relative slope-former occurring between the two prominent ridge-forming sandstone units: the Tuscarora Formation and the Bald Eagle Formation in the Appalachian Mountains.

  1. ^ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
  2. ^ Darton, N.H., and Taff, J.A., 1896, Description of the Piedmont sheet (West Virginia-Maryland): U.S. Geological Survey Geologic Atlas of the United States, Piedmont folio, no. 28, 6 p.