| 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 | Chesterian | Iowa | Urban,J.B. Palynology and the Independence Shale of Iowa. | 1971 | |
| details | Late Tournaisian | Visean | Brazil(Paraiba) | Sundaram,D. et al. Lower Carboniferous palynomorphs from Poti Formation, Parnaiba Basin, Brazil. | 1981 |
| details | Morrowan | Desmoinesian | Iowa | Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa | 1986 |