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The Jurassic Toyora Group is studied biostratigraphically with special reference to the middle and upper Liassic ammonoids. 23 genera including 42 species of ammonoids which are described in this seri...al study indicate successive ages from Sinemurian to Bajocian. Ammonoids indicating Upper Pliensbachian to Toarcian are especially abundant, and zoning and correlation are attempted for this part on the basis of these new data. Three zones are recognized, namely Fontanelliceras fontanellense Zone, Protogrammoceras nipponicum Zone and Dactylioceras helianthoides Zone in ascending order. The assemblages of ammonoids in the Fontanelliceras fontanellense Zone and the lower half of the Protogrammoceras nipponicum Zone are well characterized by Mediterranean elements. The assemblages in the upper half of the Protogrammoceras nipponicum Zone and the Dactylioceras helianthoides Zone show somewhat high similarities to European faunas. The faunal relations with various regions are discussed and analyzed by means of SIMPSON's formula. The distribution of the lower Jurassic ammonite faunas and the relation between fauna and lithofacies are discussed in connection with the Toyora fauna. In the present part, stratigraphy is explained and 20 Domerian species of 10 ammonoid genera are described. Others are to be described in the forthcoming articles.続きを見る
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Mendeley出力
21_01_p093