Abstract
We present a biostratigraphic study of the Latentifistularia (Radiolaria) in the upper Guadalupian to lower Lopingian (upper Capitanian to lower Wuchiapingian; Permian) succession of bedded chert of the Mino Belt in the Mt. Funabuseyama area, central Japan. The rocks examined are interpreted to be of the pelagic facies on the deep-marine lower flank of a mid-Panthalassic seamount. We established six latentifistularian-based interval zones in the chert succession (ca. 12.5 m in thickness) by using the first appearance datum of the latentifistularian species. They are the Foremanhelena triangula, Ruzhencevispongus sp. B, Ruzhencevispongus sp. C, Triplanospongos angustus, Cauletella paradoxa, and Triplanospongos musashiensis interval zones in ascending order. The first interval zone is underlain by an unnamed zone characterized by Follicucullus charveti and Follicucullus spp. with minor F. bipartitus and Pseudoalbaillella sp. On the basis of the radiolarian assemblage, we correlate the Foremanhelena triangula, Ruzhencevispongus sp. B, Ruzhencevispongus sp. C, Triplanospongos angustus interval zones and the Cauletella paradoxa and Triplanospongos musashiensis interval zones with the Follicucullus charveti-Albaillella yamakitai and Neoalbaillella ornithoformis assemblage zones in Japan, respectively. The lower three interval zones and the upper two interval zones are compared with the upper Capitanian and lower Wuchiapingian, respectively. The Triplanospongos angustus Interval Zone presumably includes the Guadalupian-Lopingian boundary. Our results show that the latentifistularians can be used to formulate a biostratigraphic zonation of the upper Capitanian to lower Wuchiapingian stages, in which the albaillellarians are much less abundant and diverse. The newly proposed interval zones permit the further subdivision of upper Capitanian to lower Wuchiapingian successions.
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