Suborder:
|
Goniatitina
|
Superfamily:
|
Shumarditoidea
|
Family:
|
Perrinitidae
|
Genus:
|
Properrinites
|
Species:
|
boesei* |
Qualifier:
|
ss |
Author:
|
Plummer & Scott 1937,p.307
|
Lower Boundary:
|
UTX Admiral Fm. base, 299 million years
|
Upper Boundary:
|
UTX Upper Hueco Lst. top, 270.6 million years
|