Locality: Pit 11 spoil heap, Will-Kankakee Counties, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material:

FMNH PR558: Fragmentary skull and fragmentary skeleton.

Note: With skin impressions and toepads.

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PARDO & MANN, 2026

Localityi: Mazon Creek near Morris, Grundy County, Illinois.

Horizon: Carbondale Formation, Frances Creek Shale.

Biostratigraphy:

Age: Westphalian D, Lower Upper Silesian, Desmoniensean, Myachkovskian Stage, upper Moscovian Epoch, Late Pennsylvanian (Late Carboniferous).

Material:

LF 1232: Fragmentary skull and skeleton of a hatchling stage.

FMNH PR 5085: Fragmentary skull and skeleton of an early feeding stage.

FMNH PR 664: Fragmentary skull and skeleton of an early juvenile (Premetamorphic).