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1957年6月我們在烟筒山进行宣龙鉄矿研究时,曾根据苏联的經驗对矿层下岩系中之一层厚12米的白色石英砂岩进行了斜层理测量及交錯层理野外分类,現将分类根据論述如下:
In June 1957, when we conducted the study of Xuanlong 鉄 mine in Hutong Mountain, we conducted oblique layering surveys and cross-stratification field classification on the basis of Soviet experience of a 12-m-thick white quartz sandstone in the lower strata of the mine. The classification is based on the following discussion: