 |
| |||
| Ordovician period; Ordovician age (MichaelBurov); Ordovician time (MichaelBurov); the Ordovician (MichaelBurov); Ordovician (геол. MichaelBurov) | |||
| Ordovician system | |||
| Ordovician | |||
| the Ordovician (второй период палеозойской эры) | |||
|
ордовик : 23 do fraz, 4 tematyki |
| Geochronologia | 4 |
| Geologia | 13 |
| Makarowa | 1 |
| Stratygrafia | 5 |