| original |
Early Pennsylvanian |
Middle Pennsylvanian |
Kentucky |
Millay,M.A. et al. Feraxotheca, gen.nov., a Lyginopterid pollen organ from the Pennsylvanian of North America. |
1977 |
| details |
Pennsylvanian |
|
Nd |
Taylor,T.N. et al. Morphologic variability of Pennsylvanian Lyginopterid seed Ferms. |
1981 |
| details |
Paleozoic |
|
Nd |
Taylor,T.N. Pollen and pollen organ evolution in early seed plants. |
1981 |
| details |
Paleozoic |
|
Nd |
Taylor,T.N. Pollen and pollen organ evolution in early seed plants. |
1981 |
| details |
Carboniferous |
|
USA |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |