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Geolocation
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Author - title
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Year
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| details | Devonian | USSR(Urals) | Medvedeva,A.M. Palynological investigation of Petroleum | 1978 | |
| details | Early Frasnian | Middle Frasnian | USSR(Latvian SSR) | Ozolina,V.R. Spore-pollen spectrum of Frasnian age of Upper Devonian, Latvian SSR. | 1963 |