| link
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From
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To
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Geolocation
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Author - title
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Year
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| details | Eocene | Oligocene | Worldwide | Williams,G.L. et al. Mesozoic and Cenozoic dinoflagellates. (In:Plankton Stratigraphy. H.M.Bolli et al, editor) | 1985 |
| details | Middle Oligocene | Yugoslavia | Jelen,M. et al. Nannoplankton and dinoflagellates from the Oligocene Beds of Horn | 1980 |