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From
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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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| original | Late Eocene | Oligocene | Colombia | Sol© de Porta,N. Presence of Tythodiscus Norem in Colombia. | 1959 |
| details | Miocene | Alaska | Waloweek,W. et al. Geographic range of Tytthodiscus extended to Alaska. | 1957 | |
| original | Eocene | Late Neogene | California | Norem,W.L. Tytthodiscus, a new microfossil genus from the California Tertiary. | 1955 |