| original |
Maestrichtian |
|
Colombia |
Hammen,T.Van Der et al. The development of the Colombian flora through geological period I: Maestrichtian to Lower Tertiary. |
1954 |
| details |
Maastrichtian |
Early Miocene |
Colombia |
Hammen,T.Van Der et al. Climatic periodicity and evolution of South American Maestrichtian and Tertiary floras. A study based on pollen anaylsis in Colombia. |
1957 |
| details |
Paleocene |
|
Colombia |
Doubinger,J. Pollen and spores from the Paleocene Coal Basin of Cerrejon, (Guajira Province, Colombia). |
1973 |