ammonites
Brachiopods of Gizzard Creek Mbr., Coralville Fmn., Eastern Iowa (Devonian of the United States)

Where: Iowa (42.5° N, 92.0° W: paleocoordinates 33.4° S, 37.2° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Gizzard Creek Member (Coralville Formation), Late/Upper Givetian (388.1 - 383.7 Ma)

• Late Givetian, Strophodonta plicata Zone. This collection represents the lower 1.4 m.

• member-level stratigraphic resolution

Environment/lithology: marine; dolomite

• Said by author to be in transgressive part of cycle.
• Gizzard Creek Member is indicated on stratigraphic column as consisting of "fossiliferous dolomite".

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 35478: authorized by Michael Foote, entered by Michael Foote on 17.12.2003