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。
Wanquansi silver and gold deposit occurs in the Baiqi formation of Jurassic system, MesozoicEra.
万全寺银金矿床赋存干中生界侏罗系白旗组。
There are fine local cap formations existing in upper and lower Youshashan formation of Jurassic system.
侏罗系，下油砂山组，上油砂山组存在较好的局部盖层。
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