Where: Arkansas (35.8° N, 92.8° W)

• Paleocoordinates: 18.2° S, 39.3° W (Wright 2013)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Eumorphoceras bisulcatum ammonoid zone, Imo Formation, Arnsbergian (327.0 - 323.7 Ma)

• Imo formation, lower part.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Collected by M. Gordon, R.A. Lewandowski in 1955; reposited in the USNM

Collection methods: surface (float)

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 157992: authorized by Matthew Clapham, entered by Matthew Clapham on 13.07.2014

Creative Commons license: CC0 (CC0)