Loc. IV. West valley wall, west fork of Black River, ~½ km south Sutton's Bluff (Cambrian of the United States)

Where: Reynolds County, Missouri (37.0° N, 91.0° W: paleocoordinates 22.9° S, 87.4° W)

• outcrop-level geographic resolution

When: Potosi Formation, Trempealeauan (501.0 - 485.4 Ma)

• horizon transitional between the Potosi and Eminence formati

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

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, dolomitic chert

• Strata are in pockets of the Ozark Uplift.
• blocky chert masses full of small molds of dolomite crystals (1/4-1 mm on a side). no obvious stromatolitic association.

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 8906: authorized by Mark Patzkowsky, entered by Phil Borkow on 06.09.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• Taxonomic list may not include some hyperstrophic gastropods and undescribed trilobites which are found in the formations but not collected.
 Tryblidiida - Tryblidiidae
Proplina suttoni n. sp. Stinchcomb 1986