Where: Washington County, Missouri (37.9° N, 90.8° W: paleocoordinates 22.8° S, 86.4° W)

• outcrop-level geographic resolution

When: Plethopeltis-Dakeoceras trilobite zone, Plethopeltis Zone Member (Eminence Formation), Trempealeauan (492.5 - 485.4 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 chert

Size classes: macrofossils, mesofossils

Preservation: original calcite, replaced with silica

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 8690: authorized by Mark Patzkowsky, entered by Phil Borkow on 27.08.2000, edited by Pete Wagner

Creative Commons license: CC BY (attribution)