Genus Abacum
- Species total:
- 4
- Age range:
- 570 - 431 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Abacum | Middle Cambrian | Tremadocian |
|
| Abacum normale | Cambrian | Early Llandoverian |
|
| Abacum rudii | Tremadocian | Arenigian |
|
| Abacum sp | Early Cambrian | Early Cambrian |
|