| original |
Cenomanian |
|
Minnesota |
Pierce,R.L. Lower Upper Cretaceous plant microfossils from Minnesota. |
1961 |
| details |
Cenomanian |
|
Minnesota |
Krutzsch,W. Atlas of Middle and Upper Tertiary dispersed spores and pollen as well as microplankton of northern Middle Europe. 2. Spores of the a Nothocerotaceae and Lycopodiaceae. |
1963 |
| details |
Cenomanian |
|
Minnesota |
Srivastava,S.K. Microspores from the Fredericksburgh Group (Albian) of the southern United States. |
1975 |
| details |
Turonian |
|
France(Ardeche) |
Robaszynski,F. et al. The Turonian of the type region. |
1982 |