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纯海相层,以变质复理石层为主,夹基性、中酸性火山岩、礁灰岩,含海相化石有孔虫、珊瑚、固着蛤等。1981年第四分队再次赴该地调查,在狮泉河附近相当于日松群的上部发现了滨海相砂页岩及植物化石碎片,在离上覆早白垩世中晚期的甲岗群约30—40米处采获的化石保存较好。日松群在产植物化石地区未见底,其岩性简介如下(图2)。日松群为砂岩、页岩夹板岩,下部为含砾砂岩(2),与下伏超基性蛇纹石化方辉橄榄岩(1)呈断层接触,上覆甲岗群为炭岩(3),日松群与甲岗群为整合关系。化石产地离剖面又有3—4公里。经复查追索,在日松地区日松群上部亦存在该滨海相砂页岩,但未保存可以鉴定的植物化石。
The pure marine facies is dominated by metamorphic flysch layers, including basement, intermediate-acid volcanic rocks, reef limestone, foraminifer with marine fossils, coral, and clam fixation. In 1981, the fourth detachment went to the area again to investigate and found coastal sand shale and phytolith fragments in the upper part of the Rishon River near the Shiquanhe River. From the upper reaches of the Upper Cretaceous, Fossil collected at -40 meters is better preserved. Risum group in the plant fossil areas have not bottomed out, its lithology profile is as follows (Figure 2). Risong Group is sandstone and shale with slate, and the lower part is pebbly sandstone (2), which is in fault contact with the underlying ultra-basic serpentinization of hectorite (1) ), The Japanese Song Group and A Gang group for the integration of relations. Fossil production area is 3-4 km away from the section. After review and recourse, the littoral sand shale also existed in the upper part of the Risum Group in the Risum area, but no identifiable plant fossils were preserved.