The Middle Permian MaokouFormation is generally overlain by the Late Permian Emeishan basalts in eastern Yunnan and western Guizhou in the west of the Yangtze platform.
The Karst system in Maokouformation (P) is classified into three different types: intraformation paleokarst, Yangxin surface paleokarst, and fissure-cavern system karst.
泸州地区茅口组灰岩岩溶分为三种类型:层间古岩溶、阳顶古岩溶、缝洞系岩溶。
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Regional biostratigraphic investigation of the MaokouFormation leads to the proposal that a rapid crustal uplift and doming prior to the eruption of the Emeishan basalts.