| 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 | Namurian B | Westphalian A | Iowa | Ravn,R.L. et al. A Morrowan, (Upper Carboniferous), miospore flora from eastern Iowa, USA. | 1982 |
| details | Morrowan | Iowa | Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa | 1986 | |
| details | Middle Pennsylvanian | Illinois | Mahaffy,J.F. Vegetational history of the Springfield Coal (Middle Pennsylvanian of Illinois) and distribution patterns of a Tree-Fern miospore, Thymospora pseudothiessenii, based on miospore profiles | 1988 |