There are many means to detenninating median size, including grain size analysis, thin section and log information.
粒度中值的确定方法较多，包括粒度分析（激光法、筛析法）、薄片粒度分析及应用测井资料计算粒度中值。
2
The median grain size value and magnetic susceptibility in the Dashu-Baiyu section show a positive correlation, but a negative correlation with the color L.