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Geolocation
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Author - title
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Year
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| details | Devonian | Tertiary | Nd | Radforth,N.W. et al. Floral transgression of major geological time zones. | 1956 |
| details | Early Cretaceous | Nd | Radforth,N.W. et al. Floral transgression of major geological time zones. | 1956 | |
| details | Tertiary | Nd | Radforth,N.W. et al. Floral transgression of major geological time zones. | 1956 | |
| original | Nd | Nd | Schopf,J.M. et al. An annotated synopsis of Paleozoic fossil spores and the definition of generic groups. | 1944 |