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Author - title
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Year
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| details | Late Siegenian | Early Emsian | W.Germany(Rhineland) | Volkmer,U. Micropalaeontology (palynology) and biostratigraphy of the Odenspielian strata (Siegenian / Emsian boundary zone) at the type locality at Odenspiel (Oberbergischesland) at the original locality of the Siegenian stage (Lower Devonian). | 1986 |
| details | Late Siegenian | W.Germany(N.Rhine) | Volkmer,U. Palynology of the Odenspiel Beds at the Siegenian type Region (Bergisches Land/ Siegerland) of the Lower Devonian | 1988 |