Some researchers have pointed out the key to the regional correlation of the upper Pre-cambrian in South Liaoning is how to link and correlate with Jixian and Xiadong stratotypes.
辽南上元古界的区域对比的关键是如何与蓟县层型、峡东层型的衔接或对比。
2
Vertically, 3sets of source rocks including the Lower Cambrian, the Middle-o-Upper Ordovician-Lower Silurian and the Permian were developed in Chinese Paleozoic Marine basins.