YUSHANOGRAPTUS,A NEW GRAPTOLITE GENUS FROM THE NINGKUO SHALE(LOWER ORDOVICIAN)OF YUSHAN,NORTHEASTERN JIANGXI(KIANGSI)
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Abstract:
The new genus Yushanograptus described in the present paper is a monotypic genuswith Yushanograptus separatus gen.et sp.nov.as the genotype which is represented by5 specimens securd by one of the writers(Han)in the summer of 1961 from the NingkuoShale at the locality near Lijiapeng of the Yushan district,northeastern Jiangxi(Kiangsi)Province(Field No.F61001).The marked features of the new genus are the two long and slender primary stipesand the Goniograptid type in branching.The young forms of this new graptolite bear astriking resemblance to the slender Didymograpti,such as Didymograptus gracilis T?rn-quist,D.cognatus Harris et Thomas etc.The same is the case in Zygograptus,particul-arly in Zygograptus irregularis Harris et Thomas.In the mode of branching of the
