鄂西崆岭群微古植物的发现及其时代探讨

崆岭群分布于鄂西宜昌县、兴山县一带的黄陵背斜核部,为一套前震旦纪结晶变质岩系。在大理岩、含石墨片麻岩样品中发现一些简单球形类为主的微古植物化石,具有一定的时代指示意义。黄陵背斜北部的崆岭群划分下岩组、中岩组和上岩组,依据微古化石,中岩组归属早元古代。上岩组应为中—晚元古代。黄陵背斜南部的崆岭群从下往上划分为古村坪组、小以村组和庙湾组,依据微古化石,小以村组和庙湾组形成时期应为中元古代。

Discovery of micropalaeophytes from Kongling Group,Western Hubei,and Discussion on th age

The Kongling Group is distributed over core of Huangling anticline in yichang county and Xingshan county, western Huhei province ·It’s pre-Zhendan （sinian） metamorphic rocks of Crytalline basement. The simple spherical micro-fossils have been diswvered from Specimens of Marbles and graphite-bearing gneisses. They are provident with certain significance on the age. northern Kongling Group are divided in ascending order into three units: the lower-rock formation, the middle-rock formation and the upper-rock formation. Leiorninuscula minuta, Peotosphaeridium solidura, Leiopsophosphaera sP., Trematosphaeridium sp., Polyporata obsoleta, obtained from middle-rock formation, the forming age is considered that it corresponds to early proterozoic Era. Favososphaeridium cf. densum, Leiopso-phosphaera densa, Margorninuscula sp., Leiominuscula sp., Trematosphaerigiurn minuturn, Dictyosphae-ra sp., Taeniatum crassum, Polyyorata microporasa, polyporata obsoleta, Lignurn sp. obtained from upper-rock formation, this formation is consistent with the middle-Late Proterozoic Era. Southern Kongling Group stated that it comprises three units from bottom to top: the Gucunpeng formation, the Xiaoyicun formation and the miaowan formation. Asper-ratopsophosphara umishanensis, Orygmatosphaeridium exile, Trematosphaeridium minutum, Trematosphaeridium holtedahlii, Leiofusa digitata, Leiofusa bicornuta, Leiopsophosphara apertus, Leiopsophosphaera bullata, Leiopsophosphaera densa, Traehysphaeridium stipticum, Tracly-sphaeridium simplex, Le- iominuscula minuta, Leiominuscula incrassata, Protosphaeridium infriatum, Palea-morpha figurata, Taeniatum crassum, Taeniatum Simplex, Synsphaeridium Longlutinatum, Schizofusa sp., Nucellosphaeridium sp., Margominuscula sp., Dictyosphaera sp., Triangumorpha sp., Turuchania ternata, Pterosperomopsis oculatus obtained froas Miaowan formation and Xiaoyicun formation, the forming is mid-dle proterozoic Era.