岩石碎屑和矿物颗粒野外圆度目测法已长期应用于第四纪地质调查中。作为一种野外方法,圆度分析应用于碎屑组分,尤其是砾石和粗砾部分是简单的。事实证明,当圆度分析作为一种工具用米解决沉积物简单的成因问题时,四级圆度的划分已是相当满意了。但把圆度分析应用于较复杂的成因问题时,只靠增加圆度级数通常是很不够的。一般来讲,关键在于 The visual measure of the field roundness of rock debris and mineral particles has long been used in the Quaternary geological survey. As a field method, circularity analysis is applied to the detritus components, especially the gravel and gravel parts. As it turns out, when roundness analysis is used as a tool to solve simple causes of sediment in meters, the division of the fourth degree roundness is quite satisfactory. However, when roundness analysis is applied to more complicated genetic problems, it is usually not enough to increase the roundness series only. In general, the key is