( oxifordian - kimmeridgian ) , xueshan fm . ( tithonian - berriasian ) . according to field investigation , thin section identification and many other methods of sedimentary petrology , rock types of jurassic strata include carbonates , argillaceous rocks and clastic rocks 结合野外观察和室内镜下鉴定等多种沉积岩石研究方法,研究区侏罗系岩石类型计有碳酸盐岩、泥质岩和碎屑岩三大类。
百科解释
In the geologic timescale, the Kimmeridgian is an age or stage in the Late or Upper Jurassic epoch or series. It spans the time between 155.