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ID 117696
タイトル別表記
"Tethyan"-"Northern Tethyan" transitional bivalve-fauna from the Kurosegawa Belt of Central Shikoku
四国中央部黒瀬川帯混在型群集
著者
香西, 武 鳴門教育大学
キーワード
下部白亜系
古生物地理
非海生二枚貝
テチス
太平洋
西南日本外帯
黒瀬川
Lower Cretaceous
paleobiogeography
non-marine bivalves
Tethys
Pacific
Outer Zone of SW Japan
Kurosegawa
資料タイプ
紀要論文
抄録
The Early Cretaceous bivalve fauna from the Kurosegawa Belt in Central Shikoku was studied with respect to the faunal affinity. In the Kurosegawa Belt, two faunal-types of Hauterivian bivalves have been recognized (Kozai et al., 2002). The one, Tatsukawa-type from the Monobegawa Group is distributed in the Northern Kurosegawa Belt. Another one, Shobu-type from the Nankai and Takegatani groups is distributed in the southern Kurosegawa Belt. Based on the specific compositon, the former is regarded as "Tethyan fauna", and the later is regarded as "northern Tethyan fauna" of Tashiro (1994, 2000). The specific compositions of these two faunas are quite different except for the cosmopolitan species. A transitional fauna between the Tatsukawa-type and Shobu-type was newly discovered in Hauterivian sandstone bed of brackish facies in the north-south intermediate part of the Kurosegawa Belt. Among the six local species, Protocardia ibukii, Costocyrena otsukai, Pulsidis antiqua and Tetoria Sanchuensis are the Tatsukawa-type elements. Isodomella matsumotoi and Eomiodon matsumotoi are the Shobu-type elements. In addition to the finding of the marine Barremian "Tethyan"-"Northern Tethyan" transitional bivalve-fauna, new discovery of the Hauterivian brackish trasitional-fauna is significant for the analysis of paleobiogeography and tectonics during and after the Early Cretaceous. Especially, the existence of the transitional fauna indicates that the "Tethyan" and "Northern Tethyan" faunas are paleobiogeographicaly closer.
掲載誌名
鳴門教育大学研究紀要. 自然科学編
ISSN
13434403
cat書誌ID
AN10416738
出版者
鳴門教育大学
18
開始ページ
19
終了ページ
28
発行日
2003-03-07
EDB ID
出版社版DOI
出版社版URL
フルテキストファイル
言語
jpn
著者版フラグ
出版社版
部局
理工学系