Also known as Mazon Creek

Where: Illinois (41.3° N, 88.2° W: paleocoordinates 4.7° S, 23.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Francis Creek Shale Member (Carbondale Formation), Westphalian D (309.8 - 307.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: interdistributary bay; lithified, concretionary, ferruginous mudstone

Size class: macrofossils

Preservation: mold/impression, concretion

Collected by George Langford in 1949; reposited in the FMNH

Primary reference: E. S. Richardson. 1956. Pennsylvanian Invertebrates of the Mazon Creek Area, Illinois. Fieldiana: Geology 12(2):3-76 [C. Labandeira/C. Labandeira/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 122530: authorized by Matthew Clapham, entered by Matthew Clapham on 02.01.2012

Creative Commons license: CC BY (attribution)