near Smithville (Ordovician of the United States)

Where: Lawrence County, Arkansas (36.1° N, 91.3° W: paleocoordinates 24.8° S, 78.7° W)

• coordinate based on nearby landmark

When: Black Rock Formation, Floian (477.7 - 470.0 Ma)

Environment/lithology: marine; lithology not reported

Size classes: macrofossils, mesofossils

Preservation: recrystallized, original aragonite, replaced with calcite

Primary reference: E. O. Ulrich, A. F. Foerste, and A.K. Miller. 1943. Ozarkian and Canadian cephalopods. Part II, Brevicones. Geological Society of America Special Papers 49:1-240 [P. Wagner/P. Wagner/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 189296: authorized by Björn Kröger, entered by Björn Kröger on 10.10.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Endocerida - Piloceratidae
"Cassinoceras arkansasense" = Expandocassinoceras arkansasense
"Cassinoceras arkansasense" = Expandocassinoceras arkansasense Ulrich et al. 1943