Potomac Creek tracksite (bed 4) (Cretaceous of the United States)

Also known as Bachman locality

Where: Stafford County, Virginia (38.4° N, 77.5° W: paleocoordinates 32.6° N, 31.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Patuxent Formation (Potomac Group), Aptian (125.0 - 113.0 Ma)

• probably from upper half of formation

• bed-level stratigraphic resolution

Environment/lithology: fluvial-deltaic; massive, fine-grained, gray, yellow, silty sandstone

• "a lower fluvial braided-stream or upper deltaic environment."
• "Sandstone, dominantly fine-grained but very fine- to medium, silty, yellowish-gray (5YR8/1), contains mudballs, carbon chips scattered on bedding surfaces, stem fragments and impressions scattered throughout, faintly laminated but mostly massive, symmetrical ripples and interference ripples on laminar surfaces, dinosaur footprints within this interval."

Size class: macrofossils

Preservation: cast, mold/impression, trace

Collected by J. Bachman; reposited in the UNSM

Collection methods: surface (in situ),

Primary reference: R. E. Weems and J. M. Bachman. 1997. Cretaceous anuran and dinosaur footprints from the Patuxent Formation of Virginia. Proceedings of the Biological Society of Washington 110(1):1-17 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 146639: authorized by Matthew Carrano, entered by Matthew Carrano on 29.06.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Ornithischia - Iguanodontipodidae
Amblydactylus sp.
Amblydactylus sp. Sternberg 1932 ornithopod
USNM 475492
 Theropoda -
Megalosauropus sp.
Megalosauropus sp. Colbert and Merrilees 1967 theropod
USNM 475489-475491