Ammonidium |
Ammonidium microfurcatum
|
Nd |
Nd |
|
Ammonidium |
Ammonidium paleozoicum
|
Nd |
Tournaisian |
|
Ammonidium |
Ammonidium palmitellum
|
Nd |
Llandoverian |
Wenlockian |
Ammonidium |
Ammonidium rigidum
|
Nd |
Nd |
|
Ammonidium |
Ammonidium rigidum
|
Nd |
Wenlockian |
Ludlovian |
Ammonidium |
Ammonidium sprucegrovense
|
Nd |
Late Devonian |
|
Ammonidium |
Ammonidium uncinum
|
Nd |
Late Gedinnian |
|
Ammonidium |
Ammonidium waldronense
|
Nd |
Early Wenlockian |
|
Angularia |
Angularia
|
Nd |
Nd |
|
Angularia |
Angularia glabra
|
Nd |
Oligocene |
|
Angularia |
Angularia viridula
|
Nd |
Late Cretaceous |
|
Angulisphaerina |
Angulisphaerina
|
Nd |
Nd |
|
Angulisphaerina |
Angulisphaerina keminica
|
Nd |
Early Cambrian |
|
Angulisphaerina |
Angulisphaerina korolevii
|
Nd |
Early Cambrian |
|
Angulisphaerina |
Angulisphaerina perfosoclathrata
|
Nd |
Middle Riphean |
|
Anguloplanina |
Anguloplanina
|
Nd |
Nd |
|
Anguloplanina |
Anguloplanina delineata
|
Nd |
Vendian |
Early Cambrian |