The Bull Run Formation is a

Late Triassic The Late Triassic is the third and final epoch of the Triassic Period in the geologic time scale, spanning the time between Ma and Ma (million years ago). It is preceded by the Middle Triassic Epoch and followed by the Early Jurassic Epoch. ...

( Norian) stratigraphic unit in the eastern

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

.Bull Run Formation
at Fossilworks.org Fossil fish bones and scales have been found in outcrops of the formation's Groveton Member in

Manassas National Battlefield Park Manassas National Battlefield Park is a unit of the National Park Service located in Prince William County, Virginia, north of Manassas that preserves the site of two major American Civil War battles: the First Battle of Bull Run, also called th ...

.Hunt et al., 2006, p.64 Indeterminate fossil

ornithischian Ornithischia () is an extinct order of mainly herbivorous dinosaurs characterized by a pelvic structure superficially similar to that of birds. The name ''Ornithischia'', or "bird-hipped", reflects this similarity and is derived from the Greek st ...

tracks have been reported from the formation.Weishampel et al., 2004, pp.517-607 The Bull Run Formation was once considered part of the Culpeper Group of the

Newark Supergroup The Newark Supergroup, also known as the Newark Group, is an assemblage of Upper Triassic and Lower Jurassic sedimentary rocks which outcrop intermittently along the United States East Coast. They were deposited in a series of Triassic basins ap ...

, but the

United States Geological Survey The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, ...

no longer formally recognizes this formation (it is ''abandoned'').Bull Run
National Geologic Map Database, Geolex — Unit Summary,

USGS The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, a ...

Fossil content

The following fossils were reported from the formation: * '' Rutiodon cf. manhattanensis'' ;Ichnofossils * '' Agrestipus hottoni'' * '' Eubrontes cursorius'' * '' Kayentapus minor'' * '' Grallator (Eubrontes)'' * '' Anomoepus sp.'' * '' Diplurus sp.''

References

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 * * 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 Geologic formations of Maryland Geologic formations of Virginia Triassic System of North America Triassic geology of Virginia Norian Stage Mudstone formations Shale formations Siltstone formations Lacustrine deposits Ichnofossiliferous formations Paleontology in Virginia {{Virginia-geologic-formation-stub

Fossil content

See also

References

Bibliography