| details |
Carboniferous |
|
USA |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |
| details |
Middle Pennsylvanian |
|
Iowa |
Good,C.W. Taxonomic and stratigraphic significance of the dispersed spore genus Calamospora. |
1977 |
| details |
Pennsylvanian |
|
USA |
Good,C.W. Pennsylvanian-Age Calamitean cones, elater-bearing spores, and associated vegetative organs. |
1975 |
| details |
|
|
Kansas |
Potonie,R. Fossil sporae in situ. Comparison with the sporae dispersae. Addition to the synopsis of the sporae in situ. |
1965 |
| details |
Nd |
|
Nd |
Felix,C.J. Some Neglected aspects of plant microfossil research. |
1960 |
| original |
Desmoinesian |
|
Iowa |
Baxter,R.W. Palaeostachya andrewsii, a new species of Calamitean cone from the American Carboniferous. |
1955 |