Latest Pleistocene Japanese Sea lion (Otariidae) fossil from the riverbed of the Hanamurogawa River west of Kasumigaura Lake, Ibaraki Prefecture
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- Iizumi Katsunori
- Graduate School of Science and Engineering, Ibaraki University
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- Koda Yoshiki
- Ibaraki Nature Museum
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- Koike Wataru
- Ibaraki Nature Museum
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- Nishimoto Toyohiro
- National Museum of Japanese History
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- Ando Hisao
- Department of Earth Science, Faculty of Science, Ibaraki University
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- Date Motoshige
- Department of Japanese History, School of Cultural and Social Studies, The Graduate University for Advanced Studies
Bibliographic Information
- Other Title
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- 茨城県霞ヶ浦西部花室川河床礫層より産出した後期更新世末期のニホンアシカ化石
- イバラキケン カスミガウラ セイブ ハナムロガワ カショウレキソウ ヨリ サンシュツ シタ コウキ コウシン セイ マッキ ノ ニホンアシカ カセキ
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Abstract
A limb bone of a marine mammal, recently recovered from the riverbed of the Hanamurogawa River, Tsukuba City, Ibaraki Prefecture, central Japan, is identified as the left humerus of an adult male Japanese Sea Lion, Zalophus japonicus (pinniped). A metapodial specimen reported by Nakashima et al. (2002) was re-analyzed and identified as an astragalus of an adult female of Z. japonicus. The humerus of the present study is inferred to have been derived from the Sakuragawa Terrace Deposits or their equivalents, based on radiocarbon dating (27,900±120 14C BP and 31,950-31,300 cal BP) of bone collagen and the mode of fossil occurrence. This evidence indicates that the deposits bearing mammalian fossils such as Palaeoloxodon naumanni and associated cervids were deposited in the latest Pleistocene. The taphonomical processes by which the humerus and astragalus of Z. japonicus ended up in a fossil assemblage dominated by land mammals should be further investigated in view of human activity during the Late Paleolithic period.
Journal
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- The Journal of the Geological Society of Japan
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The Journal of the Geological Society of Japan 116 (5), 243-251, 2010
The Geological Society of Japan
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Details 詳細情報について
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- CRID
- 1390001206237770240
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- NII Article ID
- 130000413337
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- NII Book ID
- AN00141768
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- COI
- 1:CAS:528:DC%2BC3cXovFCnur8%3D
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- ISSN
- 13499963
- 00167630
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- NDL BIB ID
- 10727750
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed