Where: Searcy County, Arkansas (35.9° N, 92.6° W: paleocoordinates 10.8° S, 32.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Eumorphoceras milleri ammonoid zone, Fayetteville Formation, Pendleian (330.9 - 327.0 Ma)

• Fayetteville shale, 100 ft (by barometer) below base of 11-ft limestone unit or 175 below top.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary shale

Size class: macrofossils

Collected by M. Gordon, R.A. Lewandowski in 1953; 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 157880: authorized by Matthew Clapham, entered by Matthew Clapham on 09.07.2014

Creative Commons license: CC BY (attribution)