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From
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Geolocation
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Author - title
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Year
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| details | Bathonian | Nd | Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. | 1994 | |
| details | Early Sinemurian | North America | Smith,P.L. et al. North America | 1994 | |
| details | Late Bathonian | Early Callovian | France(Normandie) | Bignot,G. et al. The Late Bathonian-Early Callovian transition of the Carriere d'Escoville. | 1994 |