A film of pyrites was discovered on the interface of Lower Sinian Sidingshan Formation and Fengtai conglomerate , at Sishilichangshan Mountains in the south margin of the North China Block.

• 华北陆块南缘四十里长山地区下震旦统四顶山组叠层石白云岩与其上部凤台砾岩的接触界面上为一薄层黄铁矿,对其宏观和微观以及地球化学特征研究表明,这一接触界面为裂离不整合。