Where: Union County, Arkansas (33.3° N, 92.6° W: paleocoordinates 25.3° S, 81.4° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Smithville Formation, Cassinian (482.3 - 470.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: limestone

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Collection methods: chemical

Primary reference: E. L. Yochelson and O.A. Wise, Jr. 1972. A life association of shell and operculum in the Early Ordovician gastropod Ceratopea unguis. Journal of Paleontology 46(5):681-684 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 64598: authorized by Pete Wagner, entered by Pete Wagner on 10.09.2006

Creative Commons license: CC BY (attribution)