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| details | Early Llandoverian | Poland | Masiak,M. et al. Ordovician-Silurian boundary in the Bardo Syncline, Holy Cross Mountains, Poland - New data on fossil assemblages and sedimentary succession. | 2003 | |
| details | Llandoverian | Poland | Masiak,M. et al. Ordovician-Silurian boundary in the Bardo Syncline, Holy Cross Mountains, Poland-new data on fossil assemblages and sedimentary succession. | 2003 |