Where: St. Genevieve County, Missouri (37.9° N, 90.3° W: paleocoordinates 24.3° S, 66.8° W)

When: Plectodina tenuis conodont zone, Barnhart Formation, Chatfieldian (453.8 - 451.0 Ma)

• Cooper (1956 p. 116): Although the lower shaly part of this formation was correlated with the Spechts Ferry member of the Decorah formation by Kay (1935, p. 288), the fossils collected by the writer from the lower and upper parts indicate equivalence with the Guttenberg member of the Decorah formation rather than the Spechts Ferry." Note that this often is called Decorah, and now is called Kings Lake (either a member of the Decorah or its own formation). Overlies Plattin group & underlies Kimmswick. Conodont zone from Kolata et al. 1996.

• formation-level stratigraphic resolution

Environment/lithology: green shale and limestone

Size class: macrofossils

Reposited in the USNM

Primary reference: J. Pojeta and B. Runnegar. 1976. The paleontology of rostroconch mollusks and the early history of the phylum Mollusca. United States Geological Survey Professional Paper 968:1-88 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 167748: authorized by Pete Wagner, entered by Pete Wagner on 30.03.2015

Creative Commons license: CC BY (attribution)