Hystrichosphaeridium |
Hystrichosphaeridium arundum
|
Nd |
Late Aptian |
Cenomanian |
Hystrichosphaeridium |
Hystrichosphaeridium recurvatum
|
Nd |
Late Aptian |
Maastrichtian |
Hystrichosphaeridium |
Hystrichosphaeridium recurvatum
|
Canada(Eastern Offshore) |
Santonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium stellatum
|
Nd |
Albian |
Campanian |
Hystrichosphaeridium |
Hystrichosphaeridium stellatum
|
Canada(Eastern Offshore) |
Santonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium truncigerum
|
Nd |
Santonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium truncigerum
|
Canada(Eastern Offshore) |
Santonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium tubiferum
|
Nd |
Albian |
Maastrichtian |
Hystrichosphaeridium |
Hystrichosphaeridium tubiferum
|
South Dakota |
Campanian |
|
Hystrichosphaeropsis |
Hystrichosphaeropsis ovum
|
Nd |
Santonian |
Campanian |
Hystrichosphaeropsis |
Hystrichosphaeropsis ovum
|
Canada(Eastern Offshore) |
Santonian |
|
Impletosphaeridium |
Impletosphaeridium whitei
|
Nd |
Albian |
Campanian |
Impletosphaeridium |
Impletosphaeridium whitei
|
Canada(Eastern Offshore) |
Santonian |
|
Lanternosphaeridium |
Lanternosphaeridium axiale
|
Nd |
Maastrichtian |
|
Litosphaeridium |
Litosphaeridium siphoniphorum
|
Nd |
Albian |
Turonian |
Litosphaeridium |
Litosphaeridium siphoniphorum
|
Canada(Eastern Offshore) |
Turonian |
|
Lunatadinium |
Lunatadinium dissolutum
|
Nd |
Late Jurassic |
Early Aptian |