| 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 | Westphalian A | Stephanian B | Pennsylvania | Braman,D.R. et al. The stratigraphic and geographic distribution of Carboniferous megaspores. | 1980 |
| details | Westphalian B | Stephanian B | Michigan | Braman,D.R. et al. The stratigraphic and geographic distribution of Carboniferous megaspores. | 1980 |
| details | Early Pennsylvanian | Michigan | Arnold,C.A. Megaspores from the Michigan Coal Basin. | 1950 |