| original |
Late Cretaceous |
|
Iowa |
Schemel,M.P. Cretaceous plant microfossils from Iowa |
1950 |
| details |
Cretaceous |
|
Iowa |
Potonie,R. Synopsis of the genera of the sporae dispersae. Part 1 |
1956 |
| details |
Cenomanian |
|
Minnesota |
Hall,J.W. et al. Megaspore assemblages in the Cretaceous of Minnesota. |
1968 |
| details |
Late Cenomanian |
|
France(Dordogne) |
Colin,J.P. Plant microfossils in Cenomanian and Turonian deposits from Dordogne (southwest France) |
1973 |
| details |
Nd |
|
Nd |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |