Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
Original Papers
Early Tithonian (Late Jurassic) Ammonite Parapallasiceras newly discovered from the Itoshiro Subgroup (Tetori Group) in the Hida Belt, northern Central Japan
Tadashi SATOToshihiro YAMADA
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2005 Volume 81 Issue 7 Pages 267-272

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Abstract
Early Tithonian (Late Jurassic) ammonite Parapallasiceras cf. pseudocontiguum (Donze and Enay) was discovered in situ from the Kamihambara Formation of the Itoshiro Subgroup (Tetori Group) distributed in the Hida Belt, in Fukui Prefecture, northern Central Japan. It is a Perisphinctid characterized by polygyrate ribbing and can be compared to the said species originally described in Southeast France. The species occurs in the Lower Tithonian of the Submediterranean region. Therefore at least a part of the Itoshiro Subgroup can be dated Early Tithonian, judged by this ammonite.


(Communicated by Tatsuro MATSUMOTO, M.J.A.)
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© 2005 The Japan Academy
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