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Geolocation
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Author - title
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Year
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| details | Frasnian | USSR(Latvian SSR) | Ozolina,V.R. Pollen and spore analysis of the Frasnian age of Upper Devonian Latvian SSR. | 1960 | |
| details | Late Frasnian | USSR(Latvian SSR) | Ozolina,V.R. Spore-pollen spectrum of Frasnian age of Upper Devonian, Latvian SSR. | 1963 |