| details |
Late Oligocene |
|
Germany |
Vozzhennikova,T.F. Introduction to the study of fossilized Peridinid algae. |
1965 |
| details |
Middle Oligocene |
Middle Miocene |
Germany |
Eisenack,A. Catalog of fossil dinoflagellates, hystrichospheres and microfossils |
1964 |
| details |
Late Oligocene |
|
W.Germany(Hesse) |
Brosius,M. Plankton of the Kassel, North Hessen, marine Sand (Upper Oligocene). |
1963 |
| original |
Middle Oligocene |
Middle Miocene |
W.Germany(Niedersachsen) |
Gerlach,E. Oligocene and Miocene microfossils of Northwestern Germany, with special consideration of Hystrichospheres and dinoflagellate. |
1961 |