The paper has summarized systematically evolutionary law in time and space on petrofacies and paleogeography of Late Paleozoic era in Northern China and distributive law of depositional systems.

根据华北晚古生代沉积岩系的志,识别出29个,归并为冲积、、三角洲、潮汐砂滩、碳酸盐台地等6个沉积体系。