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Geolocation
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Author - title
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Year
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| details | Llanvirnian | France | Eisenack,A. et al. Catalog of fossil dinoflagellates, hystrichospheres and related microfossils. Acritarchs. | 1973 | |
| details | Ashgillian | Bulgaria | Kalvacheva,R.K. Acritarch stratigraphy of Lower Paleozoic formations in the West Balkan Mountains, Bulgaria. | 1978 |