Type
Zone
Age range
236.5–233.5 Ma
Late Triassic
Carnian
Metapolygnathus polygnathiformis
Metapolygnathus tadpole
Metapolygnathus intermedius
236.6236.4236.2236.0235.8235.6235.4235.2235.0234.8234.6234.4234.2234.0233.8233.6233.4