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Author - title
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Year
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| details | Early Ashgillian | Middle Ashgillian | Canada(Anticosti Island) | Jacobson,S.R. et al. Acritarch biostratigraphy of the Dicellograptus complanatus graptolite zone from the Vaureal form Ation, (Ashgillian), Anticosti Island, Quebec, Canada. | 1985 |
| details | Late Hirnantian | Algeria | Paris,F. et al. The effects of the final stages of the Late Ordovician glaciation on marine palynomorphs (chitinozoans, acritarchs, leiospheres) in Well NI-2 (northeast Algerian Sahara). | 2000 |