Genus Genus b
- Species total:
- 4
- Age range:
- 435 - 73.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Genus b | Gedinnian | Gedinnian |
|
| Genus B sp.1 | Llandoverian | Ludlovian |
|
| Genus b sp.B Chri.,1979 | Santonian | Early Campanian |
|
| Genus b sp.C Chri.,1979 | Santonian | Santonian |
|