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| Ordovician | |||
| Ordovician system | |||
| Ordovician period; Ordovician age (MichaelBurov); Ordovician time (MichaelBurov); the Ordovician (MichaelBurov); Ordovician (геол. MichaelBurov) | |||
| the Ordovician (второй период палеозойской эры) | |||
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ордовик : 23 phrases, 4 sujets |
| Géochronologie | 4 |
| Géologie | 13 |
| Makarov | 1 |
| Stratigraphie | 5 |