| link
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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 | Middle Devonian | Late Devonian | Illinois | Guennel,G.K. Devonian spores in a Middle Silurian Reef. | 1963 |
| original | Givetian | USSR(Russian Platform) | Naumova,S.N. Spore-pollen complexes of the Upper Devonian of the Russian Platform and their significance for stratigraphy | 1953 |