Tetrentactinia barysphaera Foreman, 1963: skeletal structure and age of a biostratigraphically important Famennian (Upper Devonian) radiolarian from the Ohio Shale, USA

TAxon code.-001. sTATus.-Valid. originAl diAgnosis.-"La coque de l'organisme, en cône creux très allongé, est bâtie sur un squelette siliceux plein en forme d'H tronqué. Une branche majeure différenciée de ce squelette, peut atteindre l'apex, en formant une columelle détachée de la paroi de la coque à laquelle elle est reliée par un double système trabéculaire. Cette columelle peut disparaître. La coque, également siliceuse, est brunâtre, mince, finement ponctulée, mais non perforée (à l'échelle ABSTRACT This chapter is to be used as companion text with the companion chapter, an illustrated catalogue of Paleozoic radiolarian genera found in this volume, and serves the purpose of giving the reader explanation for any taxonomic operations undertaken during the course of constructing the catalogue. These operations refer to the status of the genera as valid, junior synonym, homonym, nomen nudum, nomen dubium, or not Radiolaria. We also include diagnoses and/or descriptions in the original language published, English translations where needed, and locality and age information for the type material. RÉSUMÉ Taxonomie des genres de radiolaires paléozoïques. Cet article est un complément indispensable de la partie catalogue illustré des genres de radiolaires paléozoïques (article précédent) ; il a pour ambition de donner au lecteur toutes les informations taxonomiques nécessaires qui expliquent les changements introduits au cours de la construction du catalogue. Les statuts des genres, argumentés, sont fournis : valide, synonyme junior, homonyme, nomen nudum, nomen dubium, ou non radiolaire. De plus, il propose des traductions en Anglais des diagnoses ou définitions des genres publiées dans diverses langues et des informations sur la localité et l'âge du matériel type.

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Devonian chert in the Permian Kozuki Formation of the Ultra-Tamba Zone, eastern Okayama Prefecture, Southwest Japan

Takemura

Ueno

et al. 2018

Jour. Geol. Soc. Japan

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Devonian chert beds in the Permian Kozuki Formation of the Ultra-Tamba Zone are reported from Mimasaka City, Okayama Prefecture, Southwest Japan. The Kozuki Formation consists mainly of Permian clastic rocks and felsic tuffs with basalts, Carboniferous limestone, and Early Permian cherts, and is therefore interpreted as a Permian accretionary complex similar to the other formations of the Ultra-Tamba Zone. The Devonian chert beds are frequently intercalated with black layers composed of magnetite, in which a wellpreserved radiolarian fauna occurs. These magnetite beds with radiolarian shells indicate the sedimentary origin derived from hydrothermal activity on the seafloor. The radiolarian fauna contains Holoeciscus foremanae and H. elongatus, as well as Ceratoikiscum avimexpectans and Archocyrtium sp., indicating the Fammenian Age of Late Devonian. These are the oldest fossils in the Chugoku District and the chert beds represent one of the oldest allochthons within the accretionary complexes of Japan, similar in age to the Devonian chert of the Nedamo Belt in the Tohoku District.

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Tetrentactinia barysphaera Foreman, 1963: skeletal structure and age of a biostratigraphically important Famennian (Upper Devonian) radiolarian from the Ohio Shale, USA

Cited by 3 publications

References 28 publications

A New Genus of the Corythoecidae (Paleozoic Radiolaria) from the Changhsingian (Uppermost Permian) Dalong Formation in Southern Guizhou, South China

A New Genus of the Corythoecidae (Paleozoic Radiolaria) from the Changhsingian (Uppermost Permian) Dalong Formation in Southern Guizhou, South China

Taxonomy of Paleozoic radiolarian genera

Devonian chert in the Permian Kozuki Formation of the Ultra-Tamba Zone, eastern Okayama Prefecture, Southwest Japan

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