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Geolocation
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Author - title
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Year
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| details | Early Oligocene | Baltic | Eisenack,A. Hystricosphaeres | 1963 | |
| details | Nd | Nd | Eisenack,A. In regard to the Membranilarnax question. | 1963 | |
| original | Early Oligocene | Poland | Eisenack,A. Microfossils from the Lower Oligocene phosphorites of Samland and concerning the uniformity of Hystrichospheres. | 1954 |