Genus Form b
- Species total:
- 2
- Age range:
- 57.5 - 0.01 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Form b sp. Schu.& Chat.,1976 | Early Landenian | Early Landenian |
|
| Form B sp. Wall et al,1977 | Pleistocene | Early Holocene |
|