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.