Chemical composition of the Sinian algal and bacteria cherts in Hunan and Guizhou provinces are very pure,and the content of siliceous mineral exceeds 95 percent,and almost of them are composed of micritic quartz.

Yang described here isthe first contribution from the ichnological materials, which have been recovered from Miocene diatomaceous shale of the Shanwang basin.

By analysis of silicon-algae rock earth layer in Jidong area,eastern coal field make sure that silicon-algae rock earth layer of eastern area belongs to deposit fault distrioution,it is thin with both of sides,form of slanting to the centre steadily.