Bull Run Formation

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Bull Run Formation
Stratigraphic range: Norian
~222–210  Ma
Type Geological formation
Unit of Chatham Group
Sub-units Ball's Bluff & Groveton Members
Lithology
Primary Mudstone
Other Shale, siltstone
Location
Coordinates 38°54′N77°24′W / 38.9°N 77.4°W / 38.9; -77.4
Approximate paleocoordinates 13°18′N21°48′W / 13.3°N 21.8°W / 13.3; -21.8
Region Maryland, Virginia
Country United States
Extent Culpeper Basin
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Bull Run Formation (the United States)
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Bull Run Formation (Virginia)

The Bull Run Formation is a Late Triassic (Norian) stratigraphic unit in the eastern United States. [1] Fossil fish bones and scales have been found in outcrops of the formation's Groveton Member in Manassas National Battlefield Park. [2] Indeterminate fossil ornithischian tracks have been reported from the formation. [3]

Contents

The Bull Run Formation was once considered part of the Culpeper Group of the Newark Supergroup, but the United States Geological Survey no longer formally recognizes this formation (it is abandoned). [4]

Fossil content

The following fossils were reported from the formation: [1]

Ichnofossils

See also

References

  1. 1 2 Bull Run Formation at Fossilworks.org
  2. Hunt et al., 2006, p.64
  3. Weishampel et al., 2004, pp.517-607
  4. Bull Run, National Geologic Map Database, Geolex — Unit Summary, USGS.

Bibliography