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Author - title
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| details | Dittonian | Wales | Edwards,D. et al. In situ, pollen and spores in plant evolution. 14A -Review of in situ, spores in early land plants. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) | 1996 | |
| details | Ludlovian | Saudi Arabia | Al-Hajri,S. et al. Age and palaeoenvironment of the Sharawra Member (Silurian of North-Western Saudi Arabia) | 1998 |