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Geolocation
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Author - title
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Year
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| details | Desmoinesian | Illinois | de Wet,C.B. et al. Disrupted coal and carbonate facies within two Pennsylvanian cyclothems, southern Illinois basin, United States. | 1997 | |
| details | Duckmantian | Kentucky | Greb,S.F. et al. An Insitu occurrence of coal balls in the Amburgy Coal Bed, Pikeville Formation (Duckmantian), Central Appalachian Basin, USA. | 1999 |