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Geolocation
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Author - title
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Year
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| details | Late Cambrian | Early Ordovician | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |
| details | Early Tremadocian | W.Germany(Bavaria) | Reitz,E. Acritarchs of Early Tremadoc sediments in the Western Frankenwald area, Northeast Bavaria. | 1991 | |
| details | Tremadocian | Austria | Reitz,E. et al. Palynological evidence for Lower Ordovician rocks (Tremadoc and Arenig) in the northern Greywacke zone (Eastern Alps) | 1992 |