Genus Problematicum
- Species total:
- 10
- Age range:
- 650 - 11.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Problematicum sp | Middle Callovian | Late Callovian |
|
| Problematicum sp.A | Early Eocene | Early Eocene |
|
| Problematicum sp.I | Miocene | Miocene |
|
| Problematicum sp.I Manu.,1976 | Middle Oligocene | Early Miocene |
|
| Problematicum sp.II Manu.,1976 | Middle Oligocene | Early Miocene |
|
| Problematicum sp.III Manu.,1976 | Middle Oligocene | Early Miocene |
|
| Problematicum sp.IV Manu.,1976 | Tongrian | Middle Miocene |
|
| Problematicum sp.V | Middle Miocene | Middle Miocene |
|
| Problematicum type 1 | Vendian | Early Cambrian |
|
| Problematicum type 2 | Vendian | Early Cambrian |
|