Where: Illinois (40.5° N, 90.2° W: paleocoordinates 5.3° S, 25.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Moscovian (315.2 - 307.0 Ma)

• Shale over the lower coal seam "more than 300 feet below the surface" - Middle Pennsylvanian.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Collected by Mary Hathaway in 1857-1858; reposited in the FMNH

• Holotype lost in Chicago Fire when the Chicago Academy of Science collection burned. Fortunately, James Hall had made a good cast of holotype; plastotype is in the Hall collection at the Walker Museum, University of Chicago (now Field Museum).

Primary reference: F. B. Plummer and G. Scott. 1937. Upper Paleozoic ammonites in Texas. The University of Texas Bulletin 3701:1-516 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 131559: authorized by Matthew Clapham, entered by Matthew Clapham on 26.07.2012

Creative Commons license: CC BY (attribution)