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Author - title
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| details | Tremadocian | USSR(Russian Platform) | Andreeva,E.M. Guide complexes of plant microfossils of the Upper Proterozoic and lower deposits of the Russian Platform. (In: Palynology, Method and Stratigraphy) | 1973 | |
| details | Tremadocian | Poland | Michniak,R. et al. Discovery of Lower Paleozoic formations in the eastern part of the Kielce-Lagow Synclinorium. | 1976 |