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Author - title
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Year
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| details | Pennsylvanian | Triassic | Nd | Radforth,N.W. et al. Floral transgression of major geological time zones. | 1956 |
| details | Early Cretaceous | Late Cretaceous | Nd | Radforth,N.W. et al. Floral transgression of major geological time zones. | 1956 |
| details | Nd | Nd | Erdtman,G. Suggestions for the classification of fossil and recent pollen grains and spores. | 1947 |