| link
|
From
|
To
|
Geolocation
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Author - title
|
Year
|
|---|---|---|---|---|---|
| details | Early Pennsylvanian | Michigan | Arnold,C.A. Megaspores from the Michigan Coal Basin. | 1950 | |
| details | Carboniferous | Michigan | Arnold,C.A. An Introduction to Paleobotany. | 1947 |