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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 | Arenigian | England(Cumberland) | Molyneux,S.G. et al. Morphological variation in Coryphidium from the Arenigian serie (Lower Ordovician) of Northwestern England | 1997 | |
| details | Ordovician | Nd | Servais,T. An annotated bibliographical review of Ordovician acritarchs | 1997 |