Actipilion |
Actipilion druggii
|
Oklahoma |
Late Ordovician |
|
Ammonidium |
Ammonidium microcladum
|
Nd |
Nd |
|
Ammonidium |
Ammonidium rigidum
|
Nd |
Nd |
|
Aremoricanium |
Aremoricanium cylindrosum
|
Baltic |
Middle Ordovician |
|
Aremoricanium |
Aremoricanium decoratum
|
Oklahoma |
Llanvirnian |
Llandeilian |
Aremoricanium |
Aremoricanium deflandrei
|
France |
Llanvirnian |
|
Aremoricanium |
Aremoricanium deflandrei
|
Sweden |
Ordovician |
|
Aremoricanium |
Aremoricanium rigaudiae
|
France |
Llandeilian |
|
Aremoricanium |
Aremoricanium simplex
|
Oklahoma |
Llanvirnian |
Llandeilian |
Aremoricanium |
Aremoricanium squarrosum
|
Indiana |
Caradocian |
|
Aremoricanium |
Aremoricanium squarrosum
|
Ohio |
Caradocian |
|
Aremoricanium |
Aremoricanium syringosage
|
Oklahoma |
Late Ordovician |
|
Aremoricanium |
Aremoricanium tosotrichion
|
Oklahoma |
Llanvirnian |
Llandeilian |
Ascostomocystis |
Ascostomocystis hydria
|
Alabama |
Early Eocene |
|
Ascostomocystis |
Ascostomocystis potane
|
Mississippi |
Oligocene |
|
Asketopalla |
Asketopalla formosula
|
Oklahoma |
Middle Ordovician |
|
Axisphaeridium |
Axisphaeridium timofeevii
|
Germany |
Ordovician |
|