| 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 | Wenlockian | England(Shropshire) | Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic | 1975 | |
| details | Late Ordovician | Indiana | Colbath,G.K. Organic-walled microphytoplankton from the Eden Shale, (Upper Ordovician), Indiana, USA. | 1979 | |
| details | Wenlockian | England(Shropshire) | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |