| original |
Maastrichtian |
|
Canada(Alberta) |
Snead,R.G. Microfloral diagnosis of the Cretaceous-Tertiary boundary, Central Alberta. |
1969 |
| original |
Late Maastrichtian |
|
Utah |
Lohrengel,C.F. Palynology of the Kaiparowits Formation, Garfield County, Utah. |
1969 |
| original |
Campanian |
Maastrichtian |
Canada(Alberta) |
Gunther,P.R. et al. Megaspores and other palynomorphs of the Brazeau Formation (Upper Cretaceous) Nordegg area, Alberta, Canada. |
1972 |
| original |
Cenomanian |
|
Iowa |
Bergad,R.D. North American species of the Cretaceous megaspores Balmeisporites and Monophyllosporites. |
1973 |