| 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 | Late Cambrian | Arenigian | Canada(Newfoundland) | Martin,F. et al. Middle and Upper Cambrian acritarch and Trilobite zonation at Manuels River and Random Island, eastern Newfoundland | 1988 |
| details | Arenigian | Llandeilian | Belgium | Martin,F. Acritarchs of Sart-Bernard (Belgian Ordovician) | 1965 |
| details | Late Llandoverian | Early Wenlockian | Belgium | Cramer,F.H. Distribution of selected Silurian acritarchs an account of the palynostratigraphy and paleogeography of selected Silurian acritarch Taxa | 1970 |