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Geolocation
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Author - title
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Year
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| details | Desmoinesian | Illinois | Kosanke,R.M. Plant microfossils in correlation of Coal Beds. | 1947 | |
| details | Desmoinesian | Virgilian | Illinois | Kosanke,R.M. Plant microfossils in correlation of Coal Beds. | 1947 |
| original | Pennsylvanian | Illinois | Schopf,J.M. et al. An annotated synopsis of Paleozoic fossil spores and the definition of generic groups. | 1944 |