Where: Illinois (42.5° N, 90.2° W: paleocoordinates 19.7° S, 57.3° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Rhuddanian (443.4 - 440.8 Ma)

• "Early Llandovery (A), according to Johnson (1980) and Witzke (1983); could range as high as early B. The as yet poorly knownb fauna is not strongly diagnostic, but its position in the Iowa-Illinois section suggetss late A to early B." "Type locality is just about the Silurian-Ordovican (Maquoketa Group) contact, Tete des Morts Formation."

Environment/lithology: open shallow subtidal; bioturbated, dolomitic, shelly/skeletal wackestone

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26692: authorized by Michael Foote, entered by Michael Foote on 24.10.2002

Creative Commons license: CC BY (attribution)