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Geolocation
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Author - title
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Year
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| details | Late Volgian | USSR(Siberia) | Rovnina,L.V. et al. Microphytofossils of boundary deposits of Jurassic and Cretacous in Western Siberia. (In: Jurassic - Cretaceous Boundary. V.V.Menner, editor) | 1990 | |
| details | Early Triassic | USSR(Kazakh SSR) | Medvedeva,A.M. et al. Direct evidence for vertical oil migration in the eastern Precaspian. | 1993 |