Where: Ripley County, Missouri (36.6° N, 90.7° W: paleocoordinates 24.3° S, 82.7° W)

• coordinate based on nearby landmark

When: Roubidoux Formation, Stairsian (488.3 - 478.6 Ma)

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Preservation: mold/impression, original aragonite, replaced with calcite

Primary reference: E. O. Ulrich, A. F. Foerste, A. K. Miller and W. M. Furnish. 1944. Ozarkian and Canadian cephalopods, longicones and summary. Geological Society of America Special Paper 58:1-226 [P. Wagner/P. Wagner/B. Kröger] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 102531: authorized by Björn Kröger, entered by Björn Kröger on 17.01.2011