Type
Zone
Age range
305.7–305.2 Ma
Pennsylvanian
Kasimovian
Streptognathodus cancellosus
Idiognathodus sagittalis
Streptognathodus subexcelsus
305.72305.70305.68305.66305.64305.62305.60305.58305.56305.54305.52305.50305.48305.46305.44305.42305.40305.38305.36305.34305.32305.30305.28305.26305.24305.22305.20305.18