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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 | Early Ordovician | USSR(Estonian SSR) | Magi,S. A characterization of the type section of the Ontika Subseries. | 1984 | |
| details | Arenigian | China(Yunnan) | Gao,L.D. Lower Ordovician chitinozoans from Wuding and Luquan, Yunnan Province. | 1985 |