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Author - title
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Year
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| details | Late Gedinnian | Siegenian | Wales(Dyfed) | Wellman,C.H. et al. The Cosheston Group (Lower Old Red Sandstone) in southwest Wales: age, correlation and palaeobotanical significance. | 1998 |
| details | Late Gedinnian | Siegenian | Wales(Carmarthenshire) | Wellman,C.H. et al. The Cosheston Group (Lower Old Red Sandstone) in southwest Wales: age, correlation and palaeobotanical significance. | 1998 |