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Geolocation
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Author - title
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Year
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| details | Paleozoic | Nd | Knox,E.M. The spores of Lycopodium, Phylloglossum, Selaginella and Isoetes and their value in the study of microfossils of Paleozoic age. | 1950 | |
| details | Desmoinesian | Iowa | Schopf,J.M. et al. An annotated synopsis of Paleozoic fossil spores and the definition of generic groups. | 1944 | |
| original | Desmoinesian | Iowa | Wilson,L.R. et al. Descriptions of some unassigned plant microfossils from the Des Moines Series of Iowa. | 1940 |