Aremoricanium |
Aremoricanium squarrosum
|
USA(Mid-Continent) |
Ashgillian |
|
Aremoricanium |
Aremoricanium squarrosum
|
Czechoslovakia |
Hirnantian |
|
Aremoricanium |
Aremoricanium squarrosum
|
Africa |
Devonian |
|
Aremoricanium |
Aremoricanium squarrosum
|
Canada(Quebec) |
Early Richmondian |
|
Baltisphaeridium |
Baltisphaeridium plicatispinae
|
USSR(Baltic) |
Caradocian |
Ashgillian |
Baltisphaeridium |
Baltisphaeridium plicatispinae
|
Poland |
Caradocian |
Ashgillian |
Dactylofusa |
Dactylofusa maranhensis
|
Ghana |
Ashgillian |
Llandoverian |
Diexallophasis |
Diexallophasis remota
|
Canada(Quebec) |
Caradocian |
Telychian |
Diexallophasis |
Diexallophasis remota
|
USA(Appalachian Bn.) |
Rhuddanian |
Wenlockian |
Diexallophasis |
Diexallophasis remota
|
Poland |
Wenlockian |
|
Diexallophasis |
Diexallophasis remota
|
USSR(Baltic) |
Wenlockian |
|
Diexallophasis |
Diexallophasis remota
|
Czechoslovakia |
Caradocian |
Hirnantian |
Diexallophasis |
Diexallophasis remota
|
England |
Rhuddanian |
Ludlovian |
Diexallophasis |
Diexallophasis remota
|
Wales |
Rhuddanian |
Ludlovian |
Diexallophasis |
Diexallophasis remota
|
Belgium |
Caradocian |
Devonian |
Diexallophasis |
Diexallophasis remota
|
Africa |
Aeronian |
Devonian |
Dilatisphaera |
Dilatisphaera williereae
|
Wales |
Llandoverian |
|