This article covers the following three aspects:1. From the study on paleontology, petrology and stratigraphy, it is demonstrated that the Lower Ordovician and Upper Cambrian dolomites and their underlying dolomitic limestone so widely distributed in North China could not be regarded as being chemically precipitated from the so-called saline sea i.e. not forming a se-dimentary-stratigraphic unit; on the contrary they were formed as a result of repla* cement or dolomitizatron.2. Starting from the observation the author presents some new views on the nature of the so-called Sanshanzi Formation and the boundary between Cambrian and Ordovician systems.3. On the basis of observations given above and many basic figures, a map of litho-facies and paleogeography for the Yeli Formation of North China has been compiled. On this map are shown the old land, old sea, shallow bank, restricted sea, open sea or inter-bank sea etc. In addition, the characteristics of the lithofacies and paleogeography of the Liangjiashan Formation are also discussed here.
. 1979, 华北早奥陶世岩相古地理新探. 地质科学, 14(4): 302-313.
. A PRELIMINARY DISCUSSION ON THE LOWER ORDOVICIAN LITHO-FACIES AND PALEOGEOGRAPHY IN NORTH CHINA[J]. Chinese Journal of Geology, 1979, 14(4): 302-313.