| details |
Late Senonian |
Danian |
Germany |
Wetzel,O. Microfossils preserved in organic substances of the Baltic Cretaceous Flint. (Part 1.) |
1933 |
| details |
Late Senonian |
Danian |
Denmark |
Wetzel,O. Microfossils preserved in organic substances of the Baltic Cretaceous Flint. (Part 1.) |
1933 |
| details |
Late Senonian |
Danian |
Sweden |
Wetzel,O. Microfossils preserved in organic substances of the Baltic Cretaceous Flint. (Part 1.) |
1933 |
| details |
Late Senonian |
|
Denmark |
Wetzel,O. Micropaleontological investigation of the Upper Senonian chalk from Stevns Klint-Kridtbrud on the Danish Seeland Island, and reference to flint boulders. |
1940 |
| details |
Late Cretaceous |
|
Baltic |
Wetzel,O. Survey of Protista in the Cretaceous Baltic area which are preserved in Flintstones |
1953 |