Where: Crawford County, Missouri (38.0° N, 91.4° W: paleocoordinates 23.4° S, 81.0° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Symphysurina bulbosa trilobite zone, Van Buren Member (Gasconade Formation), Gasconadian (485.4 - 477.7 Ma)

• The chert in which the fossils occur may or may not be in place stratigraphically. So, a rating of "A" through "F" indicates stratigraphi reliability with "A" = no question as to stratigraphic position of horizon and "F" = residual material of different ages. RATING: D

• formation-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified chert and dolomite

Preservation: original calcite, replaced with silica

Reposited in the USNM

Primary reference: B. L. Stinchcomb. 1986. New Monoplacophora (Mollusca) from Late Cambrian and Early Ordovician of Missouri. Journal of Paleontology 60(3):606-626 [M. Patzkowsky/P. Borkow/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 156485: authorized by Pete Wagner, entered by Pete Wagner on 21.05.2014

Creative Commons license: CC BY (attribution)