In the Southern North China region,a series of the Late Paleozoic formation with platform facies,transitional facies and inland lake facies had been deposited.

• 南华北地区晚古生代沉积了一套台地相-海陆过渡相-内陆湖相地层,上古生界烃源岩主要为一套连续沉积的含煤岩系。