Archaeohystrichosphaeridium |
Archaeohystrichosphaeridium
|
USSR(Siberia) |
Early Cambrian |
|
Archaeohystrichosphaeridium |
Archaeohystrichosphaeridium
|
USSR(Baltic) |
Cambrian |
|
Aremoricanium |
Aremoricanium
|
Nd |
Ordovician |
Silurian |
Baltisphaeridium |
Baltisphaeridium
|
USSR(Siberia) |
Early Cambrian |
|
Baltisphaeridium |
Baltisphaeridium
|
USSR(Baltic) |
Cambrian |
|
Baltisphaeridium |
Baltisphaeridium
|
Nd |
Ordovician |
Permian |
Cymatiogalea |
Cymatiogalea
|
Africa |
Tremadocian |
|
Cymatiosphaera |
Cymatiosphaera
|
Nd |
Cambrian |
Silurian |
Deflandrastrum |
Deflandrastrum
|
Nd |
Silurian |
|
Deunffia |
Deunffia
|
Nd |
Silurian |
|
Domasia |
Domasia
|
Nd |
Silurian |
|
Duvernaysphaera |
Duvernaysphaera
|
Nd |
Devonian |
|
Estiastra |
Estiastra
|
Nd |
Silurian |
|
Hystrichosphaeridium |
Hystrichosphaeridium
|
Nd |
Ordovician |
Silurian |
Leoniella |
Leoniella
|
Nd |
Devonian |
|
Micrhystridium |
Micrhystridium
|
USSR(Siberia) |
Early Cambrian |
|
Micrhystridium |
Micrhystridium
|
USSR(Baltic) |
Cambrian |
|