unconformability

The Coal Measures Strata are divided into 1 super-sequence and 3 sequences on the basis of paleostructure surface,widespread overlap unconformability,coal seam,and channel lag deposit.

根据古构造运动面、大面超覆界面、煤层和河床滞留沉将含煤岩系划为1个超层序和3个层序。