| details |
Eocene |
|
Japan(Hokkaido I.) |
Tokunaga,S. Fossil pollen and spore from the known coal seams in the Bibai area, Ishikari Coal Field, Hokkaido. |
1955 |
| details |
Reuverian |
|
W.Germany(N.Rhine) |
Leschik,G. Pollen and spore flora of the main Brown Coal Seam of the Wetterau. |
1953 |
| details |
Late Pliocene |
|
W.Germany(Hesse) |
Leschik,G. The question of the Pliocene-Pleistocene Borderline. |
1952 |
| details |
Tertiary |
|
W.Germany(Rhineland) |
Thiergart,F. Pollen floras of the Tertiary Brown Coals of the Lower Rhine Valley. |
1950 |