Odontochitina |
Odontochitina operculata
|
Nd |
Late Hauterivian |
Campanian |
Odontochitina |
Odontochitina operculata
|
Wyoming |
Campanian |
|
Odontochitina |
Odontochitina porifera
|
Nd |
Turonian |
Campanian |
Oligosphaeridium |
Oligosphaeridium anthophorum
|
Nd |
Late Jurassic |
Early Campanian |
Oligosphaeridium |
Oligosphaeridium anthophorum
|
Canada(Eastern Offshore) |
Cenomanian |
|
Oligosphaeridium |
Oligosphaeridium anthophorum
|
Canada(Eastern Offshore) |
Santonian |
|
Oligosphaeridium |
Oligosphaeridium complex
|
Nd |
Valanginian |
Maastrichtian |
Oligosphaeridium |
Oligosphaeridium complex
|
Nd |
Santonian |
|
Oligosphaeridium |
Oligosphaeridium prolixispinosum
|
Nd |
Albian |
Cenomanian |
Oligosphaeridium |
Oligosphaeridium prolixispinosum
|
Nd |
Cenomanian |
|
Oligosphaeridium |
Oligosphaeridium pulcherrimum
|
Nd |
Valanginian |
Santonian |
Oligosphaeridium |
Oligosphaeridium pulcherrimum
|
Canada(Eastern Offshore) |
Coniacian |
|
Oligosphaeridium |
Oligosphaeridium sp.A
sp. nov. |
Canada(Eastern Offshore) |
Turonian |
|
Oligosphaeridium |
Oligosphaeridium totum
|
Nd |
Late Albian |
Cenomanian |
Ovoidinium |
Ovoidinium scabrosum
|
Nd |
Albian |
Cenomanian |
Ovoidinium |
Ovoidinium scabrosum
|
Nd |
Albian |
Early Cenomanian |
Ovoidinium |
Ovoidinium verrucosum
|
Nd |
Albian |
Cenomanian |