Type
Zone
Age range
320–318.6 Ma
Pennsylvanian
Bashkirian
Declinognathodus marginodosus
Idiognathodus sinuosus
Neognathodus askynensis
320.0319.9319.8319.7319.6319.5319.4319.3319.2319.1319.0318.9318.8318.7318.6