Basic Development Characteristics of Jurassic Cretaceous Lithostratigraphy in North China Platform

A set of complex volcanic sedimentary rocks were developed in North China Platform during Jurassic Cretaceous periods.According to the systematic studies,writers make some conclusions as follows: 1 The division of basin generations is based on tectonics.The lithostratigraphic assemblges developed in the same generation have their own special features and sedimentary sequences.There are clear tectonic faces above and beneath the assemblages and good regional correlation signs.With the development of regional tectonics,there have also their own spacial distribution frame in different generative basins. 2 In composition of Jurassic Cretaceous lithostratigraphy,the volcanic rocks are an important content which increases the complexity in stratigraphy division and correlation,The volcanic activities are controlled by tectonic movements. 3 Jurassic Cretaceous are important coal growing stages.There are three coal growing beds in total.The first one almost distributes all of North China,the second the eastern of Liaoning province,and the third the regions along 40°of North latitude. 4 Different basin growing stages have different biological assemblages.