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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 | Early Ordovician | Algeria | Stricanne,L. et al. A statistical approach to classification of the Cambro-Ordovician galeate acritarch plexus | 2002 |
| details | Early Tremadocian | Argentina(Salta) | Vergel,M.D.M. et al. Ordovician palynomorphs of Argentina: An integrated approach. (Aspects of the Ordovician System in Argentina.) | 2002 |