| original |
Early Pennsylvanian |
Middle Pennsylvanian |
Kentucky |
Millay,M.A. et al. Morphological studies of Paleozoic saccate pollen. |
1974 |
| 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 |
Late Carboniferous |
|
USA |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |
| details |
Early Pennsylvanian |
Middle Pennsylvanian |
Kentucky |
Kedves,M. Tranmission Electron Microscopy of the Fossil Gymnosperm Exines. |
1994 |