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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 | Tremadocian | Italy(Sardinia) | Barca,S. et al. Dating the uppermost part of the Cabitza Formation (southwest Sardinia, Italy) as Ordovician rather than Cambrian, due to the presence of Dictyonema flabelliforme and acritarchs; Geodynamic implications. | 1987 | |
| details | Nd | Nd | Downie,C. et al. Bibliography and index of fossil dinoflagellates and acritarchs. | 1965 | |
| details | Early Ordovician | Poland | Timofeev,B.V. Micropaleophytological research into ancient strata. | 1966 |