Where: Grundy County, Illinois (41.2° N, 88.2° W: paleocoordinates 4.8° S, 23.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• Francis Creek shale, Carbondale formation, Westphalian upper C, or lower D, Pennsylvanian.

Environment/lithology: deltaic; lithified, nodular, sideritic shale

Size class: macrofossils

Preservation: adpression, concretion

Reposited in the FMNH

Primary reference: R. Zangerl. 1979. New Chondrichthyes from the Mazon Creek fauna (Pennsylvanian) of Illinois. In M. H. Nitecki (ed.), Mazon Creek Fossils 449-500 [M. Clapham/P. Vazquez]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 132455: authorized by Matthew Clapham, entered by Priscilla Vazquez on 17.08.2012, edited by Matthew Clapham and Joseph Flannery-Sutherland

Creative Commons license: CC BY (attribution)