original |
Early Miocene |
|
Mexico(Tamaulipas) |
Salas,E. Illustrated catalogue of fossil palynomorphs from the Republic of Mexico. |
1975 |
original |
Late Thanetian |
|
Virginia |
Frederiksen,N.O. Paleogene sporomorph biostratigraphy, Northeastern Virginia. |
1979 |
original |
Lutetian |
Bartonian |
California |
Frederiksen,N.O. Middle Eocene palynomorphs from San Diego, California. Part II: Angiosperm pollen and miscellanea. |
1983 |
original |
Bartonian |
|
California |
Frederiksen,N.O. Eocene sporomorph biostratigraphy of Southern California |
1989 |