石千峰群以往被认为是一套陆相红层,在华北地区分布较广,自下而上分为孙家沟组、刘家沟组及和尚沟组。其地质时代多年来众说不一,主要有晚二叠世、二叠—三叠纪和早三叠世三种意见。张文昭、吴华元等(1957)曾在陕西岐山后周公庙等地的石千峰群中采得海相化石;第三普查勘探大队普查分队(1964)在陕西麟游紫石崖一带的刘家沟组 In the past, Shiqianfeng Group was considered as a terrestrial red layer which was widely distributed in North China and divided into Sunjiagou Formation, Liujiagou Formation and Heishigou Formation from bottom to top. The geologic age has been different for many years, mainly including Late Permian, Permian, Triassic and Early Triassic. Zhang Wenzhao and Wu Huayuan (1957) once collected marine fossils from Shiqianfeng Group in places such as Zhougongmiao in Qishan County, Shaanxi Province; and the third census investigation team general survey team (1964)