Direct correlation of radiolarian <Emphasis Type="Italic">Kilinora spiralis</Emphasis> Zone with the Late Jurassic ammonite faunal succession in the Kurisaka Formation,Kurosegawa Terrane,SW Japan |
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| Authors: | Keisuke Ishida Yasuyuki Tsujino Takeshi Kozai Tadashi Sato Francis Hirsch |
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| Institution: | 1.Laboratory of Geology, Institute of SAS, Faculty of Science,University of Tokushima,Tokushima,Japan;2.Tokushima Prefectural Museum, Bunka-no-Mori Park,Tokushima,Japan;3.Laboratory of Geosciences,Naruto University of Education,Naruto,Japan;4.Fukada Geological Institute,Bunkyo-Ku, Tokyo,Japan |
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| Abstract: | The last appearance datum of the radiolarian Kilinora spiralis is recorded above the first appearance datum of the ammonite Ataxioceras (A.) kurisakense in the Todoro Section of the Kurisaka Formation, Southern Kurosegawa Terrane, Shikoku, SW Japan. The constraint by ammonite
age prolongs the range of the Kilinora spiralis Zone, a remarkable Jurassic radiolarian zone in Japan-NW Pacific region, into the lower Kimmeridgian. The direct correlation
of the Kilinora spiralis zone with the Late Jurassic ammonite faunal succession in the Kurisaka Formation will provide a clue to the still pending
chronological difference between European and North American radiolarian zones. |
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