| details |
Late Maestrichtian |
|
North Dakota |
Pearson,D.A. et al. Palynologically calibrated vertebrate record from North Dakota consistent with abrupt dinosaur extinction at the Cretaceous-Tertiary boundary. |
2001 |
| details |
Maastrichtian |
|
North America |
Lupia,R. Discordant morphological disparity and taxonomic diversity during the Cretaceous angiosperm radiation: North American pollen record. |
1999 |
| details |
Maestrichtian |
|
Wyoming |
Farabee,M.J. Morphology of Triprojectate fossil pollen: form and distribution in space and time. |
1993 |
| details |
Maestrichtian |
|
North Dakota |
Farabee,M.J. Morphology of Triprojectate fossil pollen: form and distribution in space and time. |
1993 |