“黄家磴组”名称来源于湖北省长阳县马鞍山黄家磴，岩石形成于3.745亿年前，为滨海浅海相碎屑沉积岩。岩性为灰绿、黄灰色砂岩、粉砂岩，底部以砂质页岩，含铁砂岩与下伏为界，产植物和腕足类化石。本组含铁砂岩对峰林地貌的形成起到减缓直接风化和流水冲刷的作用。Huangjiadeng Formation is named after the place Huangjiadeng, Ma’anshan, Changyang County, Hubei Province. The formation consists of a set of coastal and shallow-sea detrital sedimentary rock strata formed 374.5 million years ago. The strata is of grayish green and yellowish grey sandstone and siltstone containing plant and Brachiopoda fossils, and its bottom boundary is between the sandy shale, iron-containing sandstone and the underlying stratum. The iron-containing sandstone played the role of slowing down the weathering and water scouring during the formation of the peak forest landform.