ILLINOIS
VERMILION COUNTY
DANVILLE
LOWER CONEMAUGH
STEPHANIAN
UPPER SILESIAN
UPPER KASIMOVIAN TO GZELIAN EPOCH
LATEST PENNSYLVANIAN (LATEST CARBONIFEROUS)
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: AMPHIBIA LINNAEUS, 1758
LABYRINTHODONTIA OR LEPOSPONDYLI
Incertae sedis
*Proterpeton gurleyi
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