ammonites
Eleutherokomma fauna, Idlewild Mbr., Lithograph City Fm., N-C and E Iowa (Devonian of the United States)

Where: Iowa (43.0° N, 93.0° W: paleocoordinates 30.5° S, 37.7° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Idlewild Member (Lithograph City Formation), Frasnian (383.7 - 376.1 Ma)

• Givetian-Frasnian boundary is within this member, and thought to be just about where this fauna comes in.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal packstone and shelly/skeletal reef rocks

• Lithologies include skeletal packstones, wackestones, mudstones, biostromal bafflestones, and framestones.

Primary reference: J. Day. 1988. The brachiopod succession of the Late Givetian-Frasnian of Iowa. In N. J. McMillan, A. F. Embry, and D. J. Glass (eds.), Devonian of the World, Volume III. Canadian Society of Petroleum Geologists. Calgary, Alberta, Canada 303-325 [M. Foote/M. Foote/M. Foote] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 35488: authorized by Michael Foote, entered by Michael Foote on 17.12.2003