Elizabeth - Galena area (Illinois) (Silurian of the United States)

Where: Jo Daviess County, Illinois (42.4° N, 90.4° W: paleocoordinates 20.1° S, 56.0° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Mosalem Formation, Llandovery (443.4 - 433.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified, argillaceous dolomite and shale

• "The sections range from 8-16 m in thickness and are subdivided...in ascending order, 1) 2-6 m sparsely fossiliferous dolomitic shale, 2) 2-6 m trilobite-dominated argillaceous dolomite, 3) 2-4 m thin-bedded argillaceous dolomite with diverse fauna."

Primary reference: W. Hickerson. 1995. An early Silurian (Early-Middle Llandoverian) trilobite fauna from the Mosalem Formation of northwestern Illinois. Abstracts with Programs - Geological Society of America 27(3):58-58 [J. Alroy/M. Sommers/A. Clement]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 2860: authorized by John Alroy, entered by Mike Sommers on 21.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• trilobites only
Show authors, comments, and common names
Trilobita
 Odontopleurida - Odontopleuridae
Exallaspis illinoisensis
 Lichida - Lichidae
Lichas sp.
Lichas sp. Dalman 1827 trilobite
 Corynexochida - Styginidae
Bumastinae indet.
Bumastinae indet. Raymond 1916 trilobite
2 genera
 Phacopida - Calymenidae
Calymene sp.
Calymene sp. Brongniart 1822 trilobite
 Phacopida - Encrinuridae
? Curriella sp.
? Curriella sp. Lamont 1978 trilobite
originally entered as "? Curriella sp."
 Proetida - Proetidae
Thebanaspis channahonensis
 Proetida - Otarionidae
Otarion sp.
Otarion sp. Zenker 1833 trilobite