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河北省蔚县煤田中侏罗统下花园组上、下段地层在沉积岩性质及含煤性等方面存在着显著差异,为不同大地构造背景及古地理条件下的产物,表示其间经历了构造运动,其界线置于杂色岩层底部为宜,从区域上看二者应为不整合接触关系。名称上没有必要使用下花园组一名,起用京西门头沟煤田的相应地层名称,将原下花园组上段改称为龙门组、原下花园组下段改称为窑坡组。
The upper and lower strata in the Upper Jurassic Xiahuayuan Formation of Yuxian Coalfield in Hebei Province have significant differences in sedimentary rock properties and coal-bearing properties, which are the products of different tectonic settings and palaeogeomorphic conditions, indicating that they experienced tectonic movements during this period, Its boundary line is placed at the bottom of variegated rock layer is appropriate, from the region point of view should be two unconformable contact. The name does not need to use under the Garden Group, the use of the corresponding strata in Beijing Mentougou coalfield name, the original garden group renamed the Longmen Group, the lower garden group renamed the slope group.