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Bull Run Formation

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Coordinates: 38°54′N 77°24′W / 38.9°N 77.4°W / 38.9; -77.4
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Bull Run Formation
Stratigraphic range: Norian
~222–210 Ma
TypeGeological formation
Unit ofChatham Group
Sub-unitsBalls Bluff & Groveton Members
Lithology
PrimaryMudstone
OtherShale, siltstone
Location
Coordinates38°54′N 77°24′W / 38.9°N 77.4°W / 38.9; -77.4
Approximate paleocoordinates13°18′N 21°48′W / 13.3°N 21.8°W / 13.3; -21.8
RegionMaryland, Virginia
Country United States
ExtentCulpeper Basin
Bull Run Formation is located in the United States
Bull Run Formation
Bull Run Formation (the United States)
Bull Run Formation is located in Virginia
Bull Run Formation
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]

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. ^ a b 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

  • Hunt, ReBecca K., Vincent L. Santucci and Jason Kenworthy. 2006. "A preliminary inventory of fossil fish from National Park Service units." in S.G. Lucas, J.A. Spielmann, P.M. Hester, J.P. Kenworthy, and V.L. Santucci (ed.s), Fossils from Federal Lands. New Mexico Museum of Natural History and Science Bulletin 34, pp. 63–69
  • R. E. Weems. 2006. The manus print of Kayentapus minor: its bearing on the biomechanics and ichnotaxonomy of early Mesozoic saurischian dinosaurs. In J. D. Harris, S. G. Lucas, J. A. Spielmann, M. G. Lockley, A. R. C. Milner, & J. I. Kirkland (eds.), The Triassic-Jurassic Terrestrial Transition. New Mexico Museum of Natural History and Science Bulletin 37:369-378
  • Template:Cite LSA ISBN 0-520-24209-2
  • R. E. Weems and P. G. Kimmel. 1993. Upper Triassic reptile footprints and a coelacanth fish scale from the Culpeper Basin, Virginia. Proceedings of the Biological Society of Washington 16(2):390-401
  • J. R. Smith. 1982. Dinosaurs in Virginia—evidence of two new genera. Lapidary Journal 36(6):1110-1111
  • R. Weems. 1979. A large parasuchian (phytosaur) from the Upper Triassic portion of the Culpeper Basin of Virginia (USA). Proceedings from the Biological Society of Washington 92(4):682-688


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