Oligosphaeridium |
Oligosphaeridium complex
|
Germany |
Early Cretaceous |
Late Cretaceous |
Oligosphaeridium |
Oligosphaeridium complex
|
Romania |
Early Cretaceous |
Late Cretaceous |
Oligosphaeridium |
Oligosphaeridium complex
|
Africa |
Early Cretaceous |
Late Cretaceous |
Oligosphaeridium |
Oligosphaeridium dictyophorum
|
W.Germany |
Late Aptian |
|
Oligosphaeridium |
Oligosphaeridium dictyostilum
|
Argentina |
Eocene |
Oligocene |
Oligosphaeridium |
Oligosphaeridium macrotubulum
|
England(Yorkshire) |
Oxfordian |
|
Oligosphaeridium |
Oligosphaeridium perforatum
|
W.Germany |
Late Hauterivian |
|
Oligosphaeridium |
Oligosphaeridium prolixispinosum
|
England(Surrey) |
Cenomanian |
|
Oligosphaeridium |
Oligosphaeridium pulcherrimum
|
Australia |
Early Cretaceous |
|
Oligosphaeridium |
Oligosphaeridium pulcherrimum
|
England(Berkshire) |
Eocene |
|
Oligosphaeridium |
Oligosphaeridium reniforme
|
Canada(Saskatchewan) |
Albian |
Cenomanian |
Oligosphaeridium |
Oligosphaeridium reniforme
|
Kansas |
Albian |
|
Oligosphaeridium |
Oligosphaeridium reticulatum
|
England(Surrey) |
Cenomanian |
|
Oligosphaeridium |
Oligosphaeridium vasiformum
|
England(Yorkshire) |
Cenomanian |
|
Omatia |
Omatia butticula
|
Alaska |
Late Valanginian |
|
Omatia |
Omatia montgomeryi
|
Australia(W.Australia) |
Late Jurassic |
|
Operculodinium |
Operculodinium centrocarpum
|
W.Germany |
Middle Oligocene |
Middle Miocene |