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在湖南常宁斗岭向斜南段的轴部以东、李家湾村东二百米处,一个钻孔场地旁,下三迭系张家坪组地层中发育有完美而复杂的小型旋卷构造群。它们除了组成连环式旋卷构造外,还组成了另一种内连环式旋卷构造。一、一般特征观察点为一铅直陡壁,高5米,地层分上、下两部分。下部为灰色薄层泥灰岩夹同色薄层钙质粉砂岩,局部夹灰绿色、白色成层极薄的粘土岩、具微细层理。上部为风化后呈土黄色钙质粉砂岩、泥岩互层。旋卷构造群主要发育在下部岩石中。陡壁东部出露一个最大“直径”为4.10米的半环状裂面,即甲环状构造,以下称甲
A perfect and complicated small-scale spiral volcanic tectonic group developed in the strata of the Zhangjiaping Formation beside the drilling site and the bottom of the Lijiawan village, east of the axis of the southern section of the Douling anticline in Changning, Hunan Province . In addition to forming a convolution, they form another type of inner convolution. First, the general characteristics of the observation point for a straight steep wall, 5 meters high, strata points, the next two parts. The lower part of the gray thin layer of marl clip the same color thin layer of calcareous siltstone, local folder gray green, white layering very thin clay rock, with fine bedding. The upper part is weathered khaki calcareous siltstone and mudstone interbed. Spinning structural group is mainly developed in the lower rock. The eastern part of the steep wall exposes a semi-annular fissure with a maximum “diameter” of 4.10 meters, ie, a ring-shaped structure,