| Fossil-Winged Fruits of Fraxinus (Oleaceae) and Liriodendron (Magnoliaceae) from the Duho Formation, Pohang Basin, Korea |
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| 作者姓名： | Seung-Ho JUNG and Seong-Joo LEE |
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| 作者单位： | Department of Geology, Kyungpook National University, Daegu 702-701, Korea |
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| 基金项目： | The research was supported by BK21 project of Department of Geology, Kyungpook National University, KNU. |
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| 摘 要： | Abstract: A total of 16 specimens of fossil-winged fruits were found from the Middle Miocene marine deposits, Duho Formation, Pohang Basin, Korea. They were identified into two structurally different groups: 15 specimens into a winged fruit of Fraxinus, and one specimen of Liriodendron. The most samaras (13 specimens) were identified as Fraxinus oishii, which is characterized by narrowly ovate or ovate–elliptic shapes that are 2.7–3.6 cm in length and 0.7–1 cm in width (l/w ratio=3.4–4). The apexes of the Fraxinus oishii samara are round or slightly emarginated, and a seed of the samara is always located at the base, of which the general shape is narrow rhombic-ellipsoidal. The seed is 1.2–2 cm long and 0.5–0.7 cm wide. Two specimens are different from the samara of Fraxinus oishii. They have a 6.6 length/width ratio (3.3 cm long and 0.5 cm wide), and thus, are temporarily classified into the Fraxinus sp. One specimen was recognized as a winged seed of Liriodendron meisenense. The wing is broadly lanceolate to elliptic in shape, has a smooth, acute apex, and is approximately 3 cm long and 0.7 cm wide. Samaras of Fraxinus oishii and Liriodendron meisenense were early reported from the Middle Miocene deposits from North Korea, but these specimens are the first discovery in South Korea. Further study of the Duho Formation may connect flora relationships between North and South Korea.
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| 关 键 词： | Key words: winged fruits Fraxinus Liriodendron Middle Miocene Pohang Basin Korea |
| 收稿时间： | 2009/7/21 0:00:00 |
| 修稿时间： | 8/9/2009 12:00:00 AM |
Fossil-Winged Fruits of Fraxinus(Oleaceae) and Liriodendron(Magnoliaceae) from the Duho Formation,Pohang Basin,Korea |
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| Authors: | Seung-Ho JUNG Seong-Joo LEE |
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| Institution: | Department of Geology, Kyungpook National University, Daegu 702-701, Korea |
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| Abstract: | A total of 16 specimens of fossil-winged fruits were found from the Middle Miocene marine deposits,Duho Formation,Pohang Basin,Korea.They were identified into two structurally different groups:15 specimens into a winged fruit of Fraxinus,and one specimen of Liriodendron.The most samaras(13 specimens) were identified as Fraxinus oishii,which is characterized by narrowly ovate or ovate-elliptic shapes that are 2.7-3.6 cm in length and 0.7-1 cm in width(I/w ratio=3.4-4).The apexes of the Fraxinus oishii samara... |
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| Keywords: | winged fruits Fraxinus Liriodendron Middle Miocene Pohang Basin Korea |
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