Protosphaeridium |
Protosphaeridium asaphum
|
USSR(Siberia) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium asaphum
|
USSR(Siberia) |
Riphean |
|
Protosphaeridium |
Protosphaeridium crispum
|
USSR(Siberia) |
Riphean |
|
Protosphaeridium |
Protosphaeridium densum
|
USSR(Karelian ASSR) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium densum
|
USSR(Ukrainian SSR) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium densum
|
USSR(Ukrainian SSR) |
Precambriam |
|
Protosphaeridium |
Protosphaeridium densum
|
USSR(Siberia) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium densum
|
USSR(Siberia) |
Riphean |
|
Protosphaeridium |
Protosphaeridium discum
|
USSR(Karelian ASSR) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium discum
|
USSR(Ukrainian SSR) |
Precambriam |
|
Protosphaeridium |
Protosphaeridium discum
|
USSR(Siberia) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium flexuosum
|
USSR(Karelian ASSR) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium flexuosum
|
USSR(Ukrainian SSR) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium flexuosum
|
USSR(Siberia) |
Middle Precambrian |
|
Protosphaeridium |
Protosphaeridium flexuosum
|
USSR(Siberia) |
Riphean |
|
Protosphaeridium |
Protosphaeridium gibberosum
|
USSR(Siberia) |
Riphean |
|
Protosphaeridium |
Protosphaeridium glumaceum
|
USSR(Siberia) |
Riphean |
|