Oligosphaeridium |
Oligosphaeridium reniforme
|
Nd |
Nd |
|
Oligosphaeridium |
Oligosphaeridium reticulatum
|
Nd |
Nd |
|
Oligosphaeridium |
Oligosphaeridium totum
|
Nd |
Nd |
|
Oligosphaeridium |
Oligosphaeridium vasiformum
|
Nd |
Nd |
|
Omatia |
Omatia alaskaensis
sp. nov. |
Alaska(Peninsula) |
Neocomian |
|
Omatia |
Omatia butticula
|
Alaska(Peninsula) |
Neocomian |
|
Omatia |
Omatia montgomeryi
|
Nd |
Nd |
|
Omatia |
Omatia pisciformis
|
Nd |
Nd |
|
Oodnadattia |
Oodnadattia tuberculata
|
Australia(NSW) |
Albian |
|
Opaeopsomus |
Opaeopsomus wapellensis
|
Nd |
Nd |
|
Operculodinium |
Operculodinium bergmannii
|
Argentina(Santa Cruz) |
Eocene |
|
Operculodinium |
Operculodinium centrocarpum
|
Nd |
Nd |
|
Operculodinium |
Operculodinium divergens
|
E.Germany |
Early Oligocene |
|
Operculodinium |
Operculodinium erinaceum
|
Germany |
Early Eocene |
|
Operculodinium |
Operculodinium erinaceum
|
Nd |
Nd |
|
Operculodinium |
Operculodinium flucturum
|
Nd |
Nd |
|
Operculodinium |
Operculodinium hirsutum
|
Nd |
Nd |
|