Where: LaSalle County, Illinois (41.3° N, 89.1° W: paleocoordinates 23.6° S, 72.2° W)

• coordinate based on nearby landmark

When: Shakopee Formation, Cassinian (482.3 - 470.0 Ma)

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Preservation: 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 101296: authorized by Björn Kröger, entered by Björn Kröger on 20.12.2010

Creative Commons license: CC BY (attribution)