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To
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Geolocation
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Author - title
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Year
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| details | Bartonian | Belgium | Rozen,B. Contribution to the study of Hystrichospheres and dinoflagellates of the Belgian Bartonian. | 1965 | |
| details | Middle Oligocene | Middle Miocene | W.Germany(Niedersachsen) | Gerlach,E. Oligocene and Miocene microfossils of Northwestern Germany, with special consideration of Hystrichospheres and dinoflagellate. | 1961 |
| original | Oligocene | Poland | Eisenack,A. Microfossils from the Lower Oligocene phosphorites of Samland and concerning the uniformity of Hystrichospheres. | 1954 |