Xinlonggou Fm

Its basal part is in an unconformable contact with the underlying Changcheng System or Jixian System, yet in the vicinity of the Kuntou-Poluo Village of Beipiao City it overlies disconformably the upper Triassic (?) Kuntoupoluo Fm (Mi Jiayu and others, 1980), and in the Zhuzhangzi area of Chaoyang City it overlies unconformably the lower Triassic Hongla Fm; [regionally, the next older unit is the upper Triassic Laohugou Fm]. Diying Huang (2019; Jurassic integrative stratigraphy and timescale of China. Science China: Earth Sciences, v. 62) column for Beipiao Basin states " A set of clastic rock strata beneath the Xinglonggou Fm in western Liaoning (formerly known as the Shimengou Fm and the Kuntouboluo Fm) currently is referred to as the Upper Triassic or Upper Triassic-Lower Jurassic Yangcaogou Fm (Mi et al., 1993; Liaoning Bureau of Geology and Mineral Exploration and Development, 1997), but this strata requires further study.

Regionally, the schematic strat column indicates the next younger unit as Beipiao Fm

The formation belongs to intermediate basic volcanic eruption-facies deposits, and is distributed essentially in the Zhuzhangzi area of Chaoyang City, and in the area between the Xinglonggou Village and the Sanbao Coal Mine of the Beipiao Basin. Its lithology varies greatly, with a thickness varying in a range from 180 m to 500 m. In the segment south of the No. 2 Pit of the Taiji area of Beipiao City the formation is composed largely of grey-violet and grey-green andesites, with the conglomerate layer there getting thinner. In the vicinity of the Kouhualin area of Chaoyang City there occurs a 25 m-thick basal conglomerate at the base of the formation.