| original |
Early Pennsylvanian |
Middle Pennsylvanian |
Kentucky |
Millay,M.A. et al. Morphological studies of Paleozoic saccate pollen. |
1974 |
| details |
Nd |
|
Nd |
Beck,C.B. Current status of the Progymnospermopsidia. |
1976 |
| details |
Pennsylvanian |
|
Nd |
Millay,M.A. et al. Chytrid like fossils of Pennsylvanian age. |
1978 |
| details |
Early Pennsylvanian |
Middle Pennsylvanian |
Nd |
Vasanthy,G. et al. The evolution of angiospermid pollen characteristics: Conjectures and Queries. (In: Proceeding of the Symposium on the Vistas in Indian Palaeobotany. K.P.Jain and R.S.Tiwari, editors) |
1990 |
| details |
Nd |
|
Nd |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |