西霞院工程上第三系地层成岩时间短，岩、土性质并存，是介于岩石与土之间的过渡性地层。
Diagenetic time of upper Tertiary strata in Xixiayuan engineering is short, and the rock and soil exist at the same time, which is transitional strata between rock and soil.
结果：广西莪术道地产区的分布受GBS的制约，广西莪术最适宜的地质背景为沙岩和页岩混合型黄红壤区。结论：广西莪术道地产区土壤受其成土母质影响；
Results:The genuine producing area of Curcuma Kwangsiensis was showed to be influenced by GBS, and the most suitable GBS was red soil mixed with shale.
但紫色土成土母岩结构疏松，易风化，抗蚀性低；
But the structure of purple soil parent material is loose and easy to efflorescent, anti-erodibility;
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