The age of coal-bearing stratum of Wangxidong used to be regarded as Jurassic system .
河北省蔚县王喜洞村附近有含煤地层零星出露，以往地质资料多定为侏罗系。
The Taibei Depression is the main oil and gas bearing area of Tuha Basin, and the coal bearing stratum of the Xishanyao Formation is the most important source rock in the area.
台北凹陷是吐哈盆地的主要含油气区，而西山窑组煤系地层是该地区的主力烃源岩。
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