云南曲靖翠峰山剖面中的分形类leperditiids及其地层意义

LEPERDITIIDS (OSTRACODA) FROM CUIFENGSHAN SECTION,11QUJING,YUNNAN AND THEIR STRATIGRAPHICAL SIGNIFICANCE

描述介形类豆石介类（ｌｅｐｅｒｄｉｔｉｉｄｓ）１３种和瘤石介类（ｂｅｙｒｉｃｈｉｉｄｓ）２种，其中包括１新种。除１种产自云南宁菠昔腊坪油果木外，其余均产自曲靖翠峰山剖面下西山村组和西冲组。据已初步掌握的华南地块泥盆纪更石介类的演化规律，推测下西山村组的地质时代可能属早泥盆世洛赫柯夫期（Ｌｏｃｈｋｏｖｉａｎ），西冲组下段可能属艾菲尔期（Ｅｉｆｅｌｉａｎ），而百冲组中段则大致可与吉维特阶（Ｇｉｖｅｔｉａｎ）对比。同时指出“Ｌｅｐｅｒｄｉｔｉａ”ｇｅｎｅｒｏｓａＪｉａｎｇ的产出层位可能是中泥盆统，而不是下二叠统。建议将志留系与泥盆系界线暂置于玉龙寺组与下西山村组之间。

Here described are 13 leperditiid and 2 beyrichiid species, among which Sinoleperditia brevis is considered as a new species. They were mainly collected from the Xiaxishancun and Xichong Formations at the Cuifengshan Section of Quiing. eastern Yunnan, except 'Leperditia' generosa Jiang which was obtained from Yougoumu of Xilaping, Ninglang orthwestern Yunnan.