Riculasphaera |
Riculasphaera loeblichii
|
Libya |
Emsian |
|
Riculasphaera |
Riculasphaera loeblichii
|
Spain |
Middle Emsian |
|
Riculasphaera |
Riculasphaera loeblichii
|
Oklahoma |
Late Gedinnian |
|
Riculasphaera |
Riculasphaera loeblichii
|
Brazil |
Emsian |
|
Saharidia |
Saharidia downiei
|
France |
Tremadocian |
|
Saharidia |
Saharidia downiei
|
Africa(Sahara) |
Early Tremadocian |
Middle Tremadocian |
Saharidia |
Saharidia downiei
|
Libya |
Early Tremadocian |
Middle Tremadocian |
Saharidia |
Saharidia fragilis
|
France |
Tremadocian |
|
Saharidia |
Saharidia fragilis
|
Algeria |
Early Tremadocian |
|
Saharidia |
Saharidia fragilis
|
Czechoslovakia |
Arenigian |
|
Saharidia |
Saharidia fragilis
|
England |
Late Tremadocian |
|
Schismatosphaeridium |
Schismatosphaeridium combazii
|
Spain |
Middle Emsian |
|
Schismatosphaeridium |
Schismatosphaeridium elegans
|
Spain |
Middle Emsian |
|
Schismatosphaeridium |
Schismatosphaeridium magnum
|
Africa |
Emsian |
|
Schismatosphaeridium |
Schismatosphaeridium magnum
|
Saudi Arabia |
Emsian |
|
Schismatosphaeridium |
Schismatosphaeridium magnum
|
Spain |
Middle Emsian |
|
Schismatosphaeridium |
Schismatosphaeridium perforatum
|
Africa(Sahara) |
Gedinnian |
Siegenian |