| original |
Oligocene |
|
Japan(Fukushima Pref.) |
Takahashi,K. Microplankton from the Asagai Formation in the Joban Coal Field. |
1964 |
| details |
Middle Oligocene |
Late Oligocene |
W.Germany(N.Rhine) |
Benedek,P.N. Phytoplanktons from the Middle and Upper Oligocene of Tonisberg, (Lower Rhine area). |
1972 |
| details |
Late Oligocene |
|
W.Germany(N.Rhine) |
Benedek,P.N. Phytoplanktons from the Middle and Upper Oligocene of Tonisberg, (Lower Rhine area). |
1972 |
| details |
Late Oligocene |
Early Miocene |
W.Germany(N.Rhine) |
Brelie,G.Von Der et al. Pollen flora and phytoplancton in the Cologne Layers and their lithostratigraphy in the Siegburg Graben. |
1981 |
| details |
Oligocene |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Oligocene |
|
Japan |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |