| details |
Maastrichtian |
Early Eocene |
Colombia |
Hammen,T.Van Der et al. Paleoclimate, stratigraphy and evolution. |
1964 |
| details |
Late Maastrichtian |
Early Eocene |
Colombia |
Hammen,T.Van Der et al. Paleoclimate, stratigraphy and evolution. |
1964 |
| details |
Maastrichtian |
Early Miocene |
British Guiana |
Hammen,T.Van Der et al. A palynological study on the Tertiary and Upper Cretaceous of British Guiana. |
1964 |
| details |
Oligocene |
Early Miocene |
British Guiana |
Hammen,T.Van Der et al. A palynological study on the Tertiary and Upper Cretaceous of British Guiana. |
1964 |
| details |
Nd |
|
Nd |
Skarby,A. Revision of Gleicheniidites senonicus Ross. |
1964 |
| details |
Late Cretaceous |
|
Minnesota |
M¤dler,K.A. Remarks on the nomenclature of Mesozoic spores |
1962 |
| details |
Nd |
|
Nd |
Potonie,R. Synopsis of the genera of the sporae dispersae. Part 3 |
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 |
Middle Oligocene |
Colombia |
Hammen,T.Van Der et al. Palynological stratigraphy of the Sabana of Bogota (East Cordillerian of Colombia). |
1957 |
| details |
Nd |
|
Nd |
Potonie,R. Synopsis of the genera of the sporae dispersae. Part 1 |
1956 |
| original |
Paleocene |
|
Colombia |
Hammen,T.Van Der et al. Description of some genera and species of fossil pollen and spores. |
1956 |