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Geolocation
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Author - title
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Year
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| details | Middle Cambrian | USSR(Russian Platform) | Andreeva,E.M. Spore and pollen assemblages in Upper Proterozoic and Paleozoic deposits of some Regions of the USSR | 1962 | |
| original | Late Cambrian | USSR(Pre-Baltic) | Timofeev,B.V. Ancient flora of the Prebaltic Region and its stratigraphic significance | 1959 |