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Geolocation
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Author - title
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Year
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| details | Middle Cambrian | Early Ordovician | USSR(Pamirs) | Sivertseva,I.A. et al. Lower Paleozoic microfossil finds in South-Eastern Pamir. (In: Microfossils USSR. T.F.Vozzhennikova et al, editors) | 1974 |
| original | Late Cambrian | USSR(Pre-Baltic) | Timofeev,B.V. Ancient flora of the Prebaltic Region and its stratigraphic significance | 1959 |