Late Permian foraminifers from the limestone block in the Southern Chichibu Terrane of west Shikoku, SW Japan

Abstract

A limestone block in the Shirokawa-Nomura area of western Shikoku (Japan) is interpreted to have been originated as a Panthalassan seamount, and is assigned to the northern part of the Southern Chichibu Terrane. The Late Permian foraminiferal fauna from this block is composed of 33 species, and is characterized by Nanlingella? sp., three unidentified species of Staffellidae, Paraglobivalvulina mira, Dagmarita chanakchiensis, Paradagmarita sp., and Partisania sp. Among them, four unidentified species are systematically described and discussed. Although this fauna is indeterminately either Wuchiapingian or Changhsingian, it is clearly Late Permian in age by comparison with Late Permian faunas in the Tethyan regions, and by the complete absence of neoschwagerinids, verbeekinids, and schwagerinids, which became extinct by the end of Middle Permian time. The limestone block in the Shirokawa-Nomura area is clearly distinguished from Upper Permian shelf limestones from the Kurosegawa, Southern Kitakami, and Maizuru terranes by its lithology and by the complete absence of the foraminifer Colaniella, one of the most important index genera in Upper Permian strata throughout the Tethyan and peri-Gondwana regions.

Latest Permian deep-water foraminifers from Daxiakou, Hubei, South China

“…Subsequently, they slowly recovered in the late Early Triassic and diversified in the Middle–Late Triassic (Tong and Shi, 2000; Groves and Altiner, 2005; Márquez, 2005; Mohtat-Aghaï and Vachard, 2005). In recent years, detailed systematic studies of latest Permian foraminifers have been widely undertaken, including faunas from South China (Wang, 1976; Lin, 1978; Zhao et al, 1981; Lin et al, 1990; Tong and Shi, 2000; Gu et al, 2002; Zhang and Hong, 2004; Song et al, 2006; Gaillot and Vachard, 2007; Gaillot et al, 2009; Song et al, 2009b), Japan (Kobayashi, 2004, 2005, 2006, 2012), Italy (Groves et al, 2007), Turkey (Groves and Altiner, 2005; Groves et al, 2005; Gaillot and Vachard, 2007), the Caucasus (Pronina-Nestell and Nestell, 2001), northwestern Serbia (Nestell et al, 2009), western Slovenia (Nestell et al, 2011), and southwestern Austria (Krainer and Vachard, 2011). Extinction and recovery patterns of foraminifers across the P–T transition were also analyzed (Altiner et al, 2005; Groves and Altiner, 2005; Groves et al, 2005; Márquez, 2005; Mohtat-Aghaï and Vachard, 2005; Groves et al, 2007; Song et al, 2009a; Song et al, 2009b; Angiolini et al, 2010).…”

Middle-Late Permian (Murgabian-Djulfian) foraminifers of the northern Maku area (western Azerbaijan, Iran

“…The "Paradagmarita" from Thailand and Pakistan are very different and probably are derived from Charliella. The "Paradagmarita" from Japan (Kobayashi, 1997b(Kobayashi, , 2004 belong to Paradagmaritopsis, a genus also present in South China (Gaillot et al, 2009 Leven and Gorgij, 2011), or related to S. croatica (Kochansky-Devidé, 1965). An atypical specimen exhibits well-developed chomata (Figure 12.12).…”

The revised Permian genusDagmaritaReitlinger, 1965 (Dagmaritinae, Foraminifera) and its phylogenetic relationships

“…Roadian (Guadalupian, Permian) to latest Changhsingian (Lopingian, Permian) of Paleotethys and Neotethys (Lin et al, 1990; Kobayashi, 2004; Gaillot and Vachard, 2007; Song et al, 2009) (Fig. 4).…”