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Geolocation
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Author - title
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Year
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| details | Early Caradocian | Saudi Arabia | Jachowicz,M. Ordovician acritarch assemblages form Central and Northwestern Saudi Arabia. (In: Palaeozoic Palynostratigraphy of the Kingdom of Saudi Arabia. B.Owens et al, editors) | 1995 | |
| details | Ashgillian | Bulgaria | Kalvacheva,R.K. Acritarch stratigraphy of Lower Paleozoic formations in the West Balkan Mountains, Bulgaria. | 1978 |