McKnight Road 6 miles north of Pittsburgh (Carboniferous to of the United States)

Also known as On the east side, near the junction of Brown's lane

Where: Pittsburgh County, Pennsylvania (40.5° N, 80.1° W: paleocoordinates 6.1° S, 16.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Casselman Formation (Conemaugh Group), Missourian to Missourian (305.9 - 303.4 Ma)

• Stratigraphically, the sandstone excavated here is positioned just above the Ames limestone, suggesting that it pertains to the upper part of the Conemaugh Group and possessing a latest Missourian to earliest Virgilian age (Romer, 1961).

Environment/lithology: terrestrial; shale and siltstone

Size class: macrofossils

Collection methods: CMHN 13942 (Carnegie Museum, Pittsburgh)

Primary reference: A. S. Romer. 1961. A large ophiacodont pelycosaur from the Pennsylvanian of the Pittsburgh region. Breviora 144:1-7 [M. Carrano/M. Carrano/E. Dunne]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 173987: authorized by Richard Butler, entered by Emma Dunne on 22.10.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

• No other taxa were recovered from the site.
 Synapsida - Ophiacodontidae
Clepsydrops magnus n. sp. Romer 1961 ophiacodont
CMNH 13942 fragmentary remains of humerus, ulna, and scapula