| details |
Paleocene |
|
Guianas |
Hammen,T.Van Der et al. Paleocene sediments in British Guiana and Surinam. |
1961 |
| details |
Paleocene |
|
Surinam |
Hammen,T.Van Der et al. Paleocene sediments in British Guiana and Surinam. |
1961 |
| details |
Nd |
|
Nd |
Zauer,V.V. et al. Taxonomy, nomenclature and description order of fossil spores and pollen. (In: Pre-Quaternary Micropaleontology) |
1960 |
| details |
Late Neogene |
|
Colombia |
Sol© de Porta,N. Palynologic observations on the Pliocene of Cartagena (Columbia). |
1960 |
| details |
Late Eocene |
Oligocene |
Colombia |
Sol© de Porta,N. Presence of Tythodiscus Norem in Colombia. |
1959 |
| 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 |
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 |
Maastrichtian |
Middle Oligocene |
Colombia |
Hammen,T.Van Der et al. Palynological stratigraphy of the Sabana of Bogota (East Cordillerian of Colombia). |
1957 |
| details |
Maastrichtian |
|
Colombia |
Hammen,T.Van Der et al. Description of some genera and species of fossil pollen and spores. |
1956 |
| original |
Maestrichtian |
Late Eocene |
Colombia |
Hammen,T.Van Der et al. The development of the Colombian flora through geological period I: Maestrichtian to Lower Tertiary. |
1954 |