roadcut along Virginia Route 55 (Triassic of the United States)

Also known as Haymarket

Where: Prince William County, Virginia (38.8° N, 77.7° W: paleocoordinates 13.2° N, 22.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bull Run Formation (Chatham Group), Norian (228.0 - 208.5 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; poorly lithified, red, silty shale

• "a weathered, soft, finely laminated, buff-pink silty shale, and siltstone"

Size class: macrofossils

Preservation: mold/impression, adpression

Collected by Parrott & Dunkle; reposited in the AMNH, UNSM

Collection methods: surface (in situ), mechanical,

Primary reference: B. Schaeffer, D. H. Dunkle, and N. G. McDonald. 1975. Ptycholepis marshi Newberry, a chondrostean fish from the Newark Group of eastern North America. Fieldiana Geology 33(12):205-233 [M. Uhen/M. Shalap/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 224089: authorized by Matthew Carrano, entered by Matthew Carrano on 13.01.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Osteichthyes
 Ptycholepiformes - Ptycholepididae
"Ptycholepis marshi" = Ptycholepis marshii
"Ptycholepis marshi" = Ptycholepis marshii Newberry 1878 ray-finned fish
USNM 18323
 Palaeonisciformes - Redfieldiidae
Redfieldius sp.
Redfieldius sp. Hay 1899
Actinopteri
 Semionotiformes - Semionotidae
Semionotus sp.
Semionotus sp. Agassiz 1832