| 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 | Permian | USSR | Chepikov,K.R. et al. Spores and pollen in oils and Gases as migration Indices. | 1971 | |
| details | Early Permian | South Dakota | Kremp,G.O.W. Report on referred fossils.I. | 1960 |