构造演化经历了基底和火山盆地形成及剥蚀三个阶段。
The tectonic evolution involved basement forming, volcanic basin forming and late erosion.
通过单井N/E沉积间断地层剥蚀量的计算和古地形与剥蚀量关系的分析，绘制了济阳坳陷N/E沉积间断地层剥蚀厚度等值线图。
Based on calculation of erosion thickness under the hiatus in some wells and correlation between erosion thicknesses and palaeotopography, contour diagrams of erosion can be mapped.
川中丘陵区地表以紫色沙页岩风化形成的紫色土壤为主，基岩风化剥蚀过程与流失过程交替进行。该区垦殖率高，植被盖度低，地形破碎，土地利用结构复杂，土壤侵蚀严重。
Soil in hilly regions in the middle of Sichuan Province is mainly a type of purple soil which has been developed from the purple shale rock.
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