Abacum |
Abacum
|
Nd |
Nd |
|
Abacum |
Abacum normale
|
Spain |
Middle Cambrian |
Early Ordovician |
Abacum |
Abacum rudii
|
Nd |
Tremadocian |
|
Acanspthominuscula |
Acanspthominuscula
|
Nd |
Nd |
|
Acanspthominuscula |
Acanspthominuscula micronata
|
Nd |
Nd |
|
Acanspthominuscula |
Acanspthominuscula spumosa
|
Nd |
Nd |
|
Acanthatractus |
Acanthatractus
|
Nd |
Nd |
|
Acanthodiacrodium |
Acanthodiacrodium
|
Nd |
Nd |
|
Acanthodiacrodium |
Acanthodiacrodium abortivum
|
W.Germany(Niedersachsen) |
Middle Cambrian |
|
Acanthodiacrodium |
Acanthodiacrodium achrasii
|
Nd |
Tremadocian |
|
Acanthodiacrodium |
Acanthodiacrodium aciculatum
|
Nd |
Late Llanvirnian |
|
Acanthodiacrodium |
Acanthodiacrodium aciferum
|
Nd |
Early Ordovician |
|
Acanthodiacrodium |
Acanthodiacrodium aciferum
|
Nd |
Middle Cambrian |
Late Cambrian |
Acanthodiacrodium |
Acanthodiacrodium aclinum
|
Nd |
Late Tremadocian |
Early Arenigian |
Acanthodiacrodium |
Acanthodiacrodium acre
|
Nd |
Late Cambrian |
|
Acanthodiacrodium |
Acanthodiacrodium adelphicum
|
Nd |
Middle Cambrian |
|
Acanthodiacrodium |
Acanthodiacrodium adligans
|
Nd |
Middle Cambrian |
|