| details |
Oligocene |
|
Germany |
Gocht,H. Hystrichospheres and other microorganisms in Oligocene deposits of North and Central Germany. |
1952 |
| details |
Ypresian |
|
Belgium |
Pastiels,A. Contribution to the study of microfossils of the Belgian Eocene. |
1948 |
| details |
Senonian |
|
Nd |
Deflandre,G. The problem of Hystrichospheres. |
1947 |
| details |
Maastrichtian |
|
Netherlands |
de Wit,R. Hystrichosphaeridae of the Limburg Flint. |
1943 |
| details |
Nd |
|
Nd |
Lejeune-Carpentier,M. The microscopic study of flint. On Hystrichosphaeridium hirsutum (Ehrenberg) and some related forms. (Ninth Note) |
1941 |
| details |
Maastrichtian |
|
Belgium |
Conrad,W. Notes on protistologiques, XIX. Some microfossils of the Cretaceous Flint. |
1941 |
| details |
Senonian |
|
France(Eure) |
Mercier,J. Upper Cretaceous microplankton from Western Basin of Paris.Preliminary Note. |
1938 |
| original |
Senonian |
|
France(Paris Basin) |
Deflandre,G. Microfossils from Cretaceous Flints.Second Part |
1937 |