THE FEATURES OF THE MICROFLORA IN SHUANGQIAOSHAN GROUP IN THE DAGANG AREA,DUCHANG COUNTY,JIANGXI PROVINCE
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摘要: 在江西北部都昌县大港一带，元古界浅变质岩系十分发育。其下部的双桥山群中含丰富的微古植物化石。以Ａｓｐｅｒａｔｏｐｓｏｐｈｏｓｐｈａｅｒａｕｍｉｓｈａｎｅｎｓｉｓ，Ｐａｌｅａｍｏｒｐｈａｐｕｎｃｔｕｔｔａ，Ｔｒｅｍａｔｏｓｐｈａｅｒ－ｉｄｉｕｍｍｉｎｕｌｕｍ，Ｌｅｉｏｆｕｓａｄｉｇｉｔａｔａ等属种为代表，该组合面貌可与华北蓟县系对比。上部的马涧桥组，不整合覆于双桥山群之上，以含Ｇｅｒｍｉｎｏｓｐｈａｅｒａｇｕｔｔａｆｏｒｍｉｓ，Ｌａｍｉｎａｔｅｓｓｐ．，Ｑｕａｄｒａｔｉｍｏｒｐｈａｓｐ．，Ｖｅｒｙｈａｉｃｈｉｕｍｓｐ．等特有分子为代表，它与双桥山群的微古植物组合有明显差别，该组层位及时代应大体相当于青白口系。Abstract: Proterozoic low grade metamorphic rock series is well developed in the Dagang area,Duchang County, northern Jiangxi. The Shuangqiaoshan Group in its lower part containsabundant microflora fossils, represented by Asperalopsophosphaera umishanensis, paleamorpha, punctutta, Trematosphaeridium minutum and Leiofusa digitata, as well as typical Jixianian ele-ments. This group may be correlated with Jixian System. The Majianqiao Formation in the up-per part overlies the Shuangqiaoshan Group unconformably. This formation contains such spe-cial elements as Germinosphaera guttaformic, Laminates sp., Quadratimorpha sp. and Very-haichium sp.,which are notably different from the microflora of the Shuangqiaoshan Group.This formation is roughly equivalent to the Qingbaikou System.
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