Suborder:
|
Goniatitina
|
Superfamily:
|
Shumarditoidea
|
Family:
|
Perrinitidae
|
Genus:
|
Properrinites
|
Species:
|
deroeveri |
Qualifier:
|
sy |
Author:
|
Gerth 1950,p.238
|
Valid:
|
Properrinites cumminsi (White 1889) |
Lower Boundary:
|
Tastubian--Sterlitamakian [TAS--STE], 290 million years
|
Upper Boundary:
|
Sakmarian--Artinskian [SAK--ART], 284.4 million years
|