USGS 15394, near Asa (Carboniferous of the United States)

Where: Oklahoma (34.7° N, 96.6° W: paleocoordinates 10.0° S, 35.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Eumorphoceras bisulcatum ammonoid zone, Caney Formation, Arnsbergian (326.4 - 318.1 Ma)

• Fossils are from limestone concretions in the Caney shale

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary shale

Size class: macrofossils

Collected by H.D. Miser in 1950; reposited in the USNM

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

Purpose of describing collection: taxonomic analysis

PaleoDB collection 157974: authorized by Matthew Clapham, entered by Matthew Clapham on 12.07.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Goniatitida - Girtyoceratidae
Eumorphoceras bisulcatum Girty 1909 ammonite