Type
Zone
Age range
297–296.5 Ma
Cisuralian
Asselian
Streptognathodus postfusus
Streptognathodus fusus
Streptognathodus constrictus-Mesogondolella belladontae
297.02297.00296.98296.96296.94296.92296.90296.88296.86296.84296.82296.80296.78296.76296.74296.72296.70296.68296.66296.64296.62296.60296.58296.56296.54296.52296.50296.48