| original |
Guadalupian |
|
Oklahoma |
Morgan,B.E. Palynology of a portion of the El Reno Group (Permian) of Southwest Oklahoma. |
1967 |
| original |
Early Guadalupian |
|
Oklahoma |
Clapham,W.B. Nature and paleogeography of Middle Permian floras of Oklahoma from their pollen record |
1970 |
| original |
Aptian |
|
|
Volkheimer,W. et al. Palynological study of the Huitrin Formation, Cretaceous of the Neuqu©n Basin, and its type locality. |
1976 |
| original |
Aptian |
Albian |
|
Volkheimer,W. et al. Stratigraphic distribution of Jurassic and Cretaceous palynomorphs in the Andean Realm and neighbouring areas of Southern South America, with special consideration of the Neuqu©n Basin. |
1981 |
| original |
Middle Cenomanian |
|
Canada(Alberta) |
Singh,C. Cenomanian microfloras of the Peace River area Northwestern Alberta |
1983 |