書誌事項
- タイトル別名
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- Stratigraphic occurrences of Mytiloides (Bivalvia) in the mid-Upper Cretaceous sequence of Hokkaido
- ホッカイドウ ノ ジョウブ ハクアケイ チュウブ ニ オケル 2マイガイルイ
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説明
Based on the stratigraphic investigations of the selected areas of Hokkaido (Fig.1), the successive occurrences of the following ten species of Mytiloides in the mid-Upper Cretaceous sequence have been clarified. The geological ages are determined by the associated ammonites and other well-known species of Inoceramus. They are here abbreviated as UC=Upper Cenomanian, LT, MT and UT=Lower, Middle and Upper Turonian, although the substages are defined tentatively. As to the definition of a species, we depend on current views of authors. In case of an unsettled taxon, we define the species on a number of specimens, admitting a considerably wide range of variation. (1) M. mikasaensis Matsumoto & Noda : UC Zone of Euomphaloceras septemseriatum; (2) M. cf. sackensis (Keller) : low LT; (3) M. columbianus (Heinz) : LT Zone of Pseudaspidoceras flexuosum; (4) M. goppelnensis (Badillet & Sornay) : LT (between 3 and 5); (5) M. mytiloides (Mantell) : mid-LT zone with Mammites sp.; (6) M. labiatus (Schlotheim) : upper LT (maybe lower or higher than 7); (7) M. subhercynicus (Seitz) : high LT; (8) M. hercynicus (Petrascheck) : isolated (highest LT or low MT); (9) M. teraokai (Matsumoto & Noda) : upper MT, Zone of Inoceramus hobetsensis, so far in Southwest Japan; (10) M. incertus (Jimbo) : UT Zone of Subprionocyclus neptuni-I. teshioensis. Some of the above species, e.g. (2), (6) and (8), are rare in the available material and need further hunting. (1) and (9) are so far endemic and should be globally searched for. However, the biostratigraphic succession of the Mytiloides species in our province is generally well correlated with that in the United States. Evolutionary and ecological problems are left for further studies.
収録刊行物
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- 化石
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化石 59 (0), 47-66, 1995
日本古生物学会
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詳細情報 詳細情報について
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- CRID
- 1390001204434354304
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- NII論文ID
- 110002703624
- 10004493320
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- NII書誌ID
- AN00041606
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- ISSN
- 24242632
- 00229202
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- NDL書誌ID
- 3919155
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
