Adnatosphaeridium |
Adnatosphaeridium vetusculum
|
England(Yorkshire) |
Early Barremian |
|
Agerasphaera |
Agerasphaera
|
California |
Danian |
|
Agerasphaera |
Agerasphaera circumtabulata
|
California |
Danian |
|
Agerasphaera |
Agerasphaera margarita
|
England(Sussex) |
Thanetian |
|
Alaskadinium |
Alaskadinium
|
Nd |
Nd |
|
Alaskadinium |
Alaskadinium wigginsii
|
Nd |
Nd |
|
Ambonosphaera |
Ambonosphaera
|
Greenland |
Early Callovian |
|
Ambonosphaera |
Ambonosphaera jurassica
|
Greenland |
Early Callovian |
|
Amiculosphaera |
Amiculosphaera
|
Atlantic(Bay of Biscay) |
Middle Miocene |
Pleistocene |
Angustidinium |
Angustidinium
|
California |
Albian |
Cenomanian |
Aprobolocysta |
Aprobolocysta
|
England(Yorkshire) |
Hauterivian |
|
Aprobolocysta |
Aprobolocysta arguta
|
England(Yorkshire) |
Hauterivian |
|
Apteodinium |
Apteodinium
|
Nd |
Nd |
|
Apteodinium |
Apteodinium syzygium
|
Canada(Arctic) |
Toarcian |
Bathonian |
Arachnodinium |
Arachnodinium
|
Antarctica |
Eocene |
Early Oligocene |
Archaeodinium |
Archaeodinium
|
Antarctica |
Eocene |
Early Oligocene |
Archaeodinium |
Archaeodinium cingulatum
|
Antarctica |
Eocene |
Early Oligocene |