CARROLL, BOSSY, MILNER, ANDREWS & WELLSTEAD, 1998

Locality: Mazon Creek, Grundy County, and Braidwood, Will County, Illinois.

Horizon: Carbondale Formation, above Morris (number 2) Coal.

Biostratigraphy:

Age: Middle Silesian series, Westephalian C, Podolskian stage, or Westephalian D, Myachkovskian stage, Moscovian Epoch, Middle Pennsylvanian (Middle Carboniferous).

Material:

MCZ 323: Skull and anterior trunk in counterparts with scales on the skull.