Where: Arkansas (34.8° N, 94.0° W: paleocoordinates 10.4° S, 33.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Gastrioceras branneri ammonoid zone, Johns Valley Formation, Bashkirian (323.2 - 315.2 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, ferruginous, nodular, yellow shale

Size class: macrofossils

Collected by M. Gordon, M.W. Ellis in 1944; reposited in the USNM

Primary reference: M. Gordon. 1964. Carboniferous Cephalopods of Arkansas. United States Geological Survey Professional Paper 460:1-322 [J. Alroy/C. Simpson/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 157979: authorized by Matthew Clapham, entered by Matthew Clapham on 12.07.2014

Creative Commons license: CC BY (attribution)