Foraminiferal fauna and lithofacies of Middle Permian limestone blocks in the middle course of Kuma River (Osakama), southern margin of the Chichibu Terrane in west Kyushu, Japan

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概要

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• Middle Permian (Midian in the Tethyan standard scale) foraminifers of 34 species assignable to 27 genera were identified in erratic limestone blocks collected on the left bank of the middle course of the Kuma River (Osakama), west Kyushu, Japan, where four species of fusulinoideans have been reported. These blocks are thought to have been derived from a small limestone contained in basaltic rocks embedded within uppermost Jurassic mudstone along the southern margin of the Chichibu Terrane (Sambosan Terrane). An Osakama foraminiferal fauna in comparison with contemporaneous faunas known from the Jurassic to Early Cretaceous terranes of Japan and in relation to the limestone lithology are described and discussed in this paper. The Osakama fauna is characterized by dominant occurrence of a newly proposed species Yabeina osakamensis contained in weakly dolomitized gray limestone consisting of fusulinoidean crinoidal bioclastic packstone/grainstone with lithic clasts of limestone. The limestone lithology and bioclasts of a primitive species of Pseudodoliolina suggest that limestone deposition initiated on the Sambosan Seamount in equatorial Panthalassa as early as early Middle Permian (early Murgabian in the Tethyan scale). The Osakama fauna is more closely related to the Kaize fauna than the Gozenyama, both of which are known from the Southern Chichibu Terrane of the Kanto Mountains. Yabeina globosa, a diagnostic species in the fusulinoidean faunas of the Chichibu and Tamba-Mino-Ashio terranes and common in black to dark gray micritic limestone, is completely absent in the present Osakama and Kaize faunas.

• 日本古生物学会の論文
• 2007-12-31

著者

• Kobayashi Fumio

  Institute Of Natural And Environmental Sciences University Of Hyogo

• Kobayashi Fumio

  Institute Of Natural And Environmental Sciences Himeji Institute Of Technology

関連論文

• Middle Permian (Midian) foraminifers of the Kamiyasse Formation in the Southern Kitakami Terrane, NE Japan
• Middle Permian foraminifers of the Izuru and Nabeyama Formations in the Kuzu area, Tochigi Prefecture, Japan : Part 1. Schwagerinid, neoschwagerinid, and verbeekinid fusulinoideans
• Late Paleozoic and Mesozoic foraminifers contained in limestone fragments of the Kamade Breccia of the Upper Cretaceous Aioi Group from Kamade, northeastern part of Aioi, Hyogo, Japan
• Middle Permian foraminifers of Kaize, southern part of the Saku Basin, Nagano prefecture, central Japan
• Foraminiferal fauna and lithofacies of Middle Permian limestone blocks in the middle course of Kuma River (Osakama), southern margin of the Chichibu Terrane in west Kyushu, Japan
• Carboniferous and Permian foraminifers from limestone fragments contained in the Upper Cretaceous Hiromine Formation in north of Himeji, Hyogo, Japan
• Early Anisian (Triassic) foraminifers from the Hiraki Formation of the Maizuru Terrane in the Tatsuno-Aioi area, Hyogo Prefecture, Japan
• Lithology and foraminiferal fauna of allochthonous limestones (Changhsingian) in the upper part of the Toyoma Formation in the South Kitakami Belt, Northeast Japan
• Middle Permian foraminifers of the Izura and Nabeyama Formations in the Kuzu area, central Japan : Part 2. Schubertellid and ozawainellid fusulinoideans, and non-fusulinoidean foraminifers

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