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Geolocation
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Author - title
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Year
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| details | Late Pottsville | Early Allegheny | Michigan | Schopf,J.M. et al. An annotated synopsis of Paleozoic fossil spores and the definition of generic groups. | 1944 |
| original | Carboniferous | Michigan | Bartlett,H.H. Fossils of the Carboniferous Coal Pebbles of the Glacial Drift at Ann Arbor. | 1928 |