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плезанский
| ярус
| плезанский | |
| geol. | Plaisancian |
| ярус | |
| gen. | circle; layer; horizon; storey; story; assise |
| chem. | compartment |
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| Plaisancian (MichaelBurov) | |||
| плезанский: 9 phrases in 3 subjects |
| Geochronology | 3 |
| Geology | 4 |
| Stratigraphy | 2 |