| Name | From | To | Age range |
|---|---|---|---|
| Ooidium unicum | Llandoverian | Llandoverian |
|
| Ooidium ventricosum | Precambriam | Potsdamian |
|
| Ooidium verrucatum | Arenigian | Early Llanvirnian |
|
| Name | From | To | Age range |
|---|---|---|---|
| Ooidium unicum | Llandoverian | Llandoverian |
|
| Ooidium ventricosum | Precambriam | Potsdamian |
|
| Ooidium verrucatum | Arenigian | Early Llanvirnian |
|