Ulmus type
- Citations total:
- 2
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Author - title
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| details | Eocene | Japan(Hokkaido I.) | Okazaki,Y. Palynological and stratigraphical studies on the Paleogene Coals in the Kushiro Coal Field, eastern Hokkaido.Geology of the Bepo Formation and its pollen analysis. Part 1. | 1957 | |
| details | Late Neogene | Japan(Hokkaido I.) | Okazaki,Y. Stratigraphical and palynological studies of the Honbetsu Group and the Ikeda Formation (Pliocene, Tertiary) in eastern Hokkaio. | 1958 |