Where: Washington County, Missouri (37.9° N, 90.8° W: paleocoordinates 23.8° S, 80.9° W)

• outcrop-level geographic resolution

When: 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: C

• formation-level stratigraphic resolution

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

Size class: macrofossils

Preservation: original calcite, replaced with silica

Reposited in the USNM

Primary reference: B.L. Stinchcomb and G. Darrough. 1995. Some molluscan problematica from the Upper Cambrian - Lower Ordovician of the Ozark uplift. Journal of Paleontology 69(1):52-65 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 64584: authorized by Pete Wagner, entered by Pete Wagner on 10.09.2006

Creative Commons license: CC BY (attribution)