| original |
Desmoinesian |
|
Iowa |
Levittan,E.D. et al. Sphenostrobus Thompsonii |
1948 |
| original |
Desmoinesian |
|
Iowa |
Levittan,E.D. et al. Sphenostrobus Thompsonii |
1948 |
| details |
Desmoinesian |
|
Iowa |
Potonie,R. Position of the Paleozoic spore genera in the natural system. |
1954 |
| details |
Nd |
|
Nd |
Felix,C.J. Some Neglected aspects of plant microfossil research. |
1960 |
| details |
Late Westphalian C |
Early Westphalian D |
Iowa |
Potonie,R. Synopsis of the Sporae in situ. |
1962 |
| details |
Pennsylvanian |
|
Nd |
Brush,G.S. et al. The natural relationships of some Carboniferous microspores |
1964 |
| details |
Paleozoic |
|
Nd |
Brush,G.S. et al. The natural relationships of some Carboniferous microspores |
1965 |
| details |
Nd |
|
Nd |
Good,C.W. Taxonomic characteristics of Sphenophyllalean Cones. |
1978 |
| details |
Carboniferous |
|
USA |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |