记述侏罗系一个新的地层单位——阳眷组,用以代表张家口地区下花园组(巴柔期)之下,古老地层(前寒武纪或奥陶纪)之上的沉积。阳眷组以砂岩、泥岩为主,底部有一层粗砂岩夹砾岩、砂砾岩透镜体,不整合于冶里组或雾迷山组之上,顶部有一层稳定的菱铁质鲕粒泥岩与下花园组为界;中、上部多为紫红色或杂色,与上覆的含煤地层差别明显;时代可能属早侏罗世晚期。 Describe a new unit of the Jurassic unit, the Yanglian Formation, to represent the deposition of ancient formations (Precambrian or Ordovician) beneath the Lower Garden Group (Baruchian) in the Zhangjiakou area. The Yangzuan Formation is dominated by sandstone and mudstone. At the bottom there is a layer of coarse sandstone conglomerate and conglomerate lenses, which are not integrated with Yeli Formation or Wumishan Formation. At the top there is a layer of stable siderite and oolitic mudstone Under the garden group as the community; the upper part of mostly purple or variegated, and overlying coal-bearing strata differences significantly; era may belong to the early Jurassic.