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塔中地区石炭系“生屑灰岩”段是沉积于浅水克拉通内助陷盆地碎屑岩一碳酸盐岩旋回层中的碳酸盐岩。由于这种沉积盆地具有水浅和底平的特点，控制沉积的水动力条件主要是潮汐作用，沉积相带模式类似于陆表海碳酸盐潮汐作用模式。另外，海平面的略微升降变化即可导致大面积碳酸盐台地的淹没与出露，因此，米级旋回非常发育。这种米级旋回层表明了碳酸盐异旋回的特点，被认为是受米兰科维奇驱动力的控制。一个米级旋回的顶部所出现的沉积间断短期暴露是针孔状溶孔形成的主要机制。
The Carboniferous “bioclastic limestone” section in the Tazhong area is a carbonate deposit that was deposited in the clastic-carbonate cycle in the shallow craton basin. Because of the shallow and flat nature of this sedimentary basin, the hydrodynamic conditions governing sedimentation are mainly tidal and the sedimentary facies pattern is similar to that of surface oceanic carbonate tides. In addition, slight fluctuations in sea level can lead to flooding and exposure of large-scale carbonate platforms. Therefore, rice-level cycles are well developed. This m-level cyclotrion signifies the characteristic of carbonate isomerism and is believed to be dominated by Milan’s driving force. The discontinuous short-term deposition of sediments on the top of a meter-scale cycle is the main mechanism for the formation of pinhole-shaped pores.