The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China

Figure 7

Evolution of the Early Cambrian Mianyang-Changning intracratonic sag (it should be noted that there is more strata of Maidiping Formation and much thicker Niutitang Formation in the center of the Mianyang-Changning sag, indicating that the initial extension as well as maximum of extension occurred during the Early Cambrian Maidiping to Niutitang periods).