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The Stratigraphic Division and Correlation of Early—Middle Jurassic Strata in Northwestern oft-com:office:smarttags" />Hebei Provinceoft-com:office:office" />

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The Early—Middle Jurassic strata in Northwestern Hebei Province even though has been researched for a long history, but it is still different with that in western Beijing (in the same region——Yanshan orogenic belt) as to the specific division and correlation. The strata in Northwestern Hebei area are divided into Nandaling Formation,   Xiahuayuan Formation,   Jiulongshan Formation, Tiaojishan Formation and Houcheng Formation while in the western Beijing area the stratum that is considered the same layer to the Xiahuayuan Formation are divided into Yaopo Formation and Longmen Formation. In this paper, the conclusions of a re-division are as follows: the Lower Jurassic Nandaling Formation, the Middle Jurassic Xiahuayuan Formation, Jiulongshan Formation, Tiaojishan Formation and Houcheng Formation, and they can be completely correlated with those in western oft-com:office:smarttags" />Beijing area. These conclusions are very important to the establishment of the Early—Middle Jurassic stratigraphic framework and the study of the tectonic evolution in the Yanshan region.
    

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