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Anisian foraminifers from allochthonous limestones of the Tanoura formation (Kurosegawa Terrane, West Kyushu, Japan) = Foraminifères anisiens dans les calcaires allochtones de la formation de Tanoura (Terrane de Kurosegawa, Ouest Kyushu, Japon)

Authors
Kobayashi, Fumio
Published in Geobios. 2005, vol. 38, no. 6, p. 751-763
Abstract Thirty-five species belonging to 21 genera of foraminifers are distinguished from allochthonous limestone blocks contained within the autochthonous mudstones and sandstones of the Carnian Tanoura Formation, Kurosegawa Terrane of West Kyushu (SW Japan). These blocks are considered to be Anisian in age, based on the occurrence of two foraminifers widely distributed in the Anisian of the Tethyan Realm, Pilammina densa and Meandrospira dinarica; they are associated with Involutinid-like forms, such as Triadodiscus and Aulotortus, and with other foraminifers. The allochthonous limestones are mostly composed of oolites, abundant bioclasts and detrital quartz grains. They are thought to have been redeposited during the Carnian on the shelf slope of the South Kitakami-Kurosegawa Old Land. Palaeogeographically, this terrane was part of the North Gondwana margin, then isolated eastwards before its Early Cretaceous amalgamation with South China. Three foraminiferal species, Triadodiscus eomesozoicus (Oberhauser), Triadodiscus? tanourensis, n. sp., and Triadodiscus? sp. are described from the Anisian allochthonous blocks.
Keywords ForaminifersAnisianAllochthonous limestoneTanoura FormationJapan
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Structures
Research group Sedimentology, Biostratigraphy and Micropaleontology
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KOBAYASHI, Fumio, MARTINI, Rossana, ZANINETTI, Louisette. Anisian foraminifers from allochthonous limestones of the Tanoura formation (Kurosegawa Terrane, West Kyushu, Japan) = Foraminifères anisiens dans les calcaires allochtones de la formation de Tanoura (Terrane de Kurosegawa, Ouest Kyushu, Japon). In: Geobios, 2005, vol. 38, n° 6, p. 751-763. https://archive-ouverte.unige.ch/unige:4137

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Deposited on : 2009-11-27

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