著者

市川 浩一郎

出版者

日本地質学会

雑誌

地質學雜誌 (ISSN:00167630)

巻号頁・発行日

vol.56, no.652, pp.17-22, 1950-05-25

被引用文献数

2

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The direct use of the terms, Norian, Carnian, etc., in the extra-Alpine region is not adequate, since the fossil content is fairly different from that in the Alpine province., Another system of nomenclature is herein proposed., In the Triassic of Japan eight ages (chronological unit) distibuted in three epochs are distinguished., Epochs are called Eo-, Meso-, and Neo-Triassic and new names for the ages are proposed., Their names, as well as the fossil contents, are presented in the list on-p.,22., Saragian and Sakawan ages in the Neo-Triassic epoch are tentatively subdiveded into two and three Sub-ages, repectively., Species marked with (+) range into the later ages, while those with (-) range from the earlier age, and the occurrence of species marked with is very rare., The time range of the remaining species in confined to one age.,