Priscotheca |
Priscotheca complanata
|
USSR(Russian Platform) |
Tremadocian |
|
Priscotheca |
Priscotheca complanata
|
Algeria |
Tremadocian |
|
Protoleiosphaeridium |
Protoleiosphaeridium conglutinatum
|
USSR(Russian Platform) |
Ludlovian |
|
Protoleiosphaeridium |
Protoleiosphaeridium conglutinatum
|
USSR(Pre-Baltic) |
Proterozoic |
Middle Ordovician |
Protoleiosphaeridium |
Protoleiosphaeridium sokolovi
|
USSR(Russian Platform) |
Ordovician |
Silurian |
Pterospermopsis |
Pterospermopsis marginatus
|
USSR(Russian Platform) |
Tremadocian |
Wenlockian |
Pterospermopsis |
Pterospermopsis marginatus
sp. nov. |
USSR(Yaroslav) |
Tremadocian |
|
Pterospermopsis |
Pterospermopsis onondagaensis
|
USSR(Russian Platform) |
Wenlockian |
|
Schismatosphaeridium |
Schismatosphaeridium faveolatum
sp. nov. |
USSR(Yaroslav) |
Early Gothlandian |
|
Schismatosphaeridium |
Schismatosphaeridium insolens
|
USSR(Russian Platform) |
Late Ordovician |
Silurian |
Schismatosphaeridium |
Schismatosphaeridium insolens
sp. nov. |
USSR(Yaroslav) |
Early Gothlandian |
|
Schismatosphaeridium |
Schismatosphaeridium mutnum
|
USSR(Russian Platform) |
Middle Ordovician |
Silurian |
Schismatosphaeridium |
Schismatosphaeridium perforatum
|
USSR(Russian Platform) |
Ordovician |
Silurian |
Schismatosphaeridium |
Schismatosphaeridium piriferum
sp. nov. |
USSR(Yaroslav) |
Early Gothlandian |
|
Schismatosphaeridium |
Schismatosphaeridium poriferum
|
USSR(Russian Platform) |
Early Gothlandian |
Late Llandoverian |
Schismatosphaeridium |
Schismatosphaeridium poriferum
sp. nov. |
USSR(Estonian SSR) |
Late Llandoverian |
|
Schismatosphaeridium |
Schismatosphaeridium similis
|
USSR(Russian Platform) |
Middle Ordovician |
Early Gothlandian |