In soumeastern Kansu,there is a vast area of metamorphosed sedimentary rockscomposed of quartzites,crystallized limestones and slates with some intercalations ofhematites exposed in the valley of Lengputze to the north of Wen Xian,and in the valleyof Sunchiayuan to the west of Kang Xian.In 1944,Yeh and Kwan named the abovementioned strata at Lengputze Lupanchiao Quartzite and referred it to Lower Carbo-niferous.Lately(1959),by the discovery of Tabulata(Favosites sp.),C.H.Huang re-garded it as the upper part of the so-called Pikou Group of Lower Palaeozoic in age.While carrying on a field exploration in 1960,one of the writers,Kuo,collected a fewfossils from the same section and the corresponding strata in Kang Xian.They arelisted helow