Lophosphaeridium |
Lophosphaeridium vetulum
|
Nd |
Georgian |
Potsdamian |
Lunulidia |
Lunulidia lunula
|
Nd |
Late Tremadocian |
|
Marrocanium |
Marrocanium simplex
|
Nd |
Arenigian |
Early Llanvirnian |
Micrhystridium |
Micrhystridium acerbum
|
Nd |
Llandoverian |
|
Micrhystridium |
Micrhystridium acum
|
Nd |
Wenlockian |
Ludlovian |
Micrhystridium |
Micrhystridium alpernii
|
Nd |
Llandoverian |
Frasnian |
Micrhystridium |
Micrhystridium breviacanthum
|
Nd |
Acadian |
|
Micrhystridium |
Micrhystridium chattonii
|
Nd |
Llandoverian |
Frasnian |
Micrhystridium |
Micrhystridium cleae
|
Nd |
Tremadocian |
|
Micrhystridium |
Micrhystridium comatum
|
Nd |
Tremadocian |
Famennian |
Micrhystridium |
Micrhystridium coronatum
|
Nd |
Llandoverian |
Frasnian |
Micrhystridium |
Micrhystridium eatonense
|
Nd |
Llanvirnian |
Wenlockian |
Micrhystridium |
Micrhystridium flandrianum
|
Nd |
Llandoverian |
Middle Siegenian |
Micrhystridium |
Micrhystridium fragile
|
Nd |
Caradocian |
Emsian |
Micrhystridium |
Micrhystridium gracile
|
Nd |
Ludlovian |
Gedinnian |
Micrhystridium |
Micrhystridium gracile
|
Nd |
Arenigian |
|
Micrhystridium |
Micrhystridium granocentricum
|
Nd |
Llandoverian |
Gedinnian |