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Author - title
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Year
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| details | Late Arenigian | Late Ashgillian | Czech Republic | Wang,W.-M. Paleofloristic and paleoclimatic implications of Neogene palynofloras in China | 1994 |
| 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 |