Genus Forma-b
- Species total:
- 3
- Age range:
- 111 - 96 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Forma-b sp | Aptian | Early Albian |
|
| Forma-b sp. Masu.,1988 | Early Cenomanian | Middle Cenomanian |
|
| Forma-b sp.1 | Maastrichtian | Maastrichtian |
|