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From
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To
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Geolocation
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Author - title
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Year
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| details | Ludlovian | Wales | Owens,B. et al. Some recent advances in Devonian palynology. A review. Report of CIMP Working Group No.13B. | 1972 | |
| original | Middle Ludlovian | Downtonian | Wales(Carmarthenshire) | Richardson,J.B. et al. Upper Silurian and Lower Devonian spore assemblages from the Welsh Borderland and South Wales | 1969 |