川鄂湘边区从西向东由隔槽式褶皱向隔档式褶皱的变化反 映在深部构造样式上，其卷入的构造层次逐渐变深，至湘西带已由侏罗山式薄皮构造转为基 底卷入式的厚皮构造，构造样式也更趋复杂,但由地表向下构造样式却普遍表现为由复杂向 简单的变化。平衡剖面分析揭示了上述规律性。区域构造分析表明，上述构造是燕山期由南 东向北西不断推进的挤压力作用的结果。%In the area of boundary among Sichuan,Hubei and Hunan,the fold style,from west t o east,varies from trough like folds to ejective folds,or from Jurassian thin-s kinned structure to thick-skinned structure which basements are drawn into,and the involved tectonic lever varies lower and lower,so the fold style varies mor e and more complex.But in generally,the more deep the depth is,the more simple t he fold type is.The analysis of different scale balanced geological cross-setio ns shows the above law.Regional tectonic study shows that above characteristics are the result of compressional deformation from southeast to northwest during Y anshanian.
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