| details |
Middle Maastrichtian |
Late Maastrichtian |
North Dakota |
Artzner,D.G. Palynology of a Volcanic Ash in the Fox Hills Formation, (Maestrichtian), of Emmons, Morton, and Sioux Counties, North Dakota. |
1974 |
| details |
Nd |
|
Nd |
Wilson,M.A. Palynology of three sections across the Uppermost Cretaceous/Paleocene boundary in the Yukon Territory and District of MacKenzie, Canada. |
1978 |
| details |
Late Cretaceous |
Paleocene |
South Dakota |
Norton,N.J. et al. Palynology of the Upper Cretaceous and Lower Tertiary in the type locality of the Hell Creek Formation, Montana, USA. |
1969 |