Orygmatosphaeridium |
Orygmatosphaeridium rubiginosum
|
USSR(Siberia) |
Vendian |
|
Orygmatosphaeridium |
Orygmatosphaeridium semireticulatum
|
USSR(Siberia) |
Vendian |
|
Protosphaeridium |
Protosphaeridium duricorium
|
USSR(Siberia) |
Middle Riphean |
Late Riphean |
Protosphaeridium |
Protosphaeridium fulvastrum
|
USSR(Siberia) |
Middle Riphean |
Vendian |
Pterospermopsimorpha |
Pterospermopsimorpha annularis
|
USSR(Siberia) |
Vendian |
|
Tasmanites |
Tasmanites variabilis
|
USSR(Siberia) |
Late Vendian |
Early Cambrian |
Trachysphaeridium |
Trachysphaeridium patellare
|
USSR(Siberia) |
Middle Riphean |
Late Riphean |
Trematosphaeridium |
Trematosphaeridium crepidale
|
USSR(Siberia) |
Middle Riphean |
Late Riphean |
Trematosphaeridium |
Trematosphaeridium holtedahlii
|
USSR(Siberia) |
Middle Riphean |
Late Riphean |