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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 | Virgilian | Texas | Stone,J.F. Palynology of the Fort Belknap Coal (Pennsylvanian), of North Central Texas. | 1966 | |
| details | Pennsylvanian | Oklahoma | Branson,C.C. et al. Fossils in Mcintosh County. | 1967 | |
| details | Atokan | Iowa | Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa | 1986 | |
| details | Middle Pennsylvanian | West Virginia | Kosanke,R.M. Palynological studies of Middle Pennsylvanian Coal Beds of the proposed Pennsylvania system stratotype in West Virginia | 1988 |