Glyptambon verrucosus-Calymene breviceps Assoc., Racine Dolo., Lehigh, Ill. (Silurian to of the United States)

Where: Illinois (41.1° N, 88.0° W: paleocoordinates 25.8° S, 51.4° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Racine Dolomite Formation, Wenlock to Wenlock (433.4 - 423.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; dolomitic, argillaceous lime mudstone

• "...association...occurs in two BAs within two distinct lithologies containing two very different brachiopod communities. Trilobites generally disarticulated...The Waldron Shale [not included here] associated with these trilobites is a calcareous mudstone containing the Howellella Community which is assiged to BA 3...[The Racine Dolomite] contains a Dicoelosia-Skenidioides Community belonging to BA 4. The taxonomic composition, abundance, and preservatioon of the trilobites, however, is very similar in both occurrences."

•SEP environmental call based on given information and regional context

• "slightly argillaceous, micritic, nonreef strata of the Racine Dolomite"

Collection methods: Percent abundances given for trilobites. Other taxa generally not listed include brachiopods, crinoids, gastropods, rugose corals, and serpulids.

Primary reference: D. G. Mikulic. 1999. Silurian trilobite associations in North America. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 793-798 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 24939: authorized by Michael Foote, entered by Michael Foote on 23.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Phacopida - Cheiruridae
Cheirurus cf. niagarensis
Cheirurus cf. niagarensis Hall 1868 trilobite
 Phacopida - Dalmanitidae
Glyptambon verrucosus
 Phacopida - Calymenidae
Calymene breviceps
Calymene breviceps Raymond 1916 trilobite
 Proetida - Aulacopleuridae
Harpidella sp.
Harpidella sp. M'Coy 1849 trilobite
 Proetida - Tropidocoryphidae
Decoroproetus sp.
Decoroproetus sp. Pribyl 1946 trilobite
 Odontopleurida - Odontopleuridae
Ceratocephala sp., Dudleyaspis sp.
Ceratocephala sp. Warder 1838 trilobite
Dudleyaspis sp. Prantl and Pribyl 1949 trilobite
 Lichida - Lichidae
Arctinurus boltoni, Dicranopeltis sp.
Arctinurus boltoni Bigsby 1825 trilobite
Dicranopeltis sp. Hawle and Corda 1847 trilobite
 Corynexochida - Illaenidae
Bumastus (Litotix) cf. armatus
 Corynexochida - Styginidae
Illaenoides sp.
Illaenoides sp. Weller 1907 trilobite