Achomosphaera |
Achomosphaera neptuni
|
Denmark |
Late Ryazanian |
Hauterivian |
Achomosphaera |
Achomosphaera neptuni
|
Denmark |
Hauterivian |
|
Adnatosphaeridium |
Adnatosphaeridium apiculatum
|
Denmark |
Portlandian |
Ryazanian |
Aldorfia |
Aldorfia dictyota
|
Denmark |
Ryazanian |
Hauterivian |
Aldorfia |
Aldorfia dictyota
|
Australia(W.Australia) |
Oxfordian |
Tithonian |
Aldorfia |
Aldorfia sp.A Dave.,1982
sp. nov. |
Denmark |
Portlandian |
|
Aldorfia |
Aldorfia spongiosa
|
Denmark |
Early Ryazanian |
|
Aldorfia |
Aldorfia spongiosa
|
Canada(NWT,Mackenzie) |
Early Valanginian |
Middle Valanginian |
Aprobolocysta |
Aprobolocysta neista
|
Denmark |
Late Portlandian |
Hauterivian |
Aprobolocysta |
Aprobolocysta varigranosa
|
Denmark |
Middle Ryazanian |
Late Ryazanian |
Aprobolocysta |
Aprobolocysta varigranosa
|
England(Yorkshire) |
Valanginian |
Hauterivian |
Apteodinium |
Apteodinium sp.A Dave.,1982
sp. nov. |
Denmark |
Early Portlandian |
Late Ryazanian |
Apteodinium |
Apteodinium spongiosum
|
Denmark |
Early Ryazanian |
|
Apteodinium |
Apteodinium spongiosum
|
Canada(NWT,Mackenzie) |
Early Valanginian |
Middle Valanginian |
Athigmatocysta |
Athigmatocysta glabra
|
Denmark |
Late Ryazanian |
Hauterivian |
Avellodinium |
Avellodinium culmula
|
Denmark |
Early Portlandian |
Late Ryazanian |
Avellodinium |
Avellodinium culmula
|
England(Dorset) |
Portlandian |
|