Renjiawan Fm

Jiang Chunfa et al named it in 1966, and it was used for the first time by the 15th Branch of Shaanxi Regional Survey Team in 1968. The named section is located between the Bipa Gorge, Nie Jia Wan, Liangdang County, Baocheng Railway. In 1960, the Shaanxi Regional Survey Team created the name “Liufengguan Group” to represent the Silurian in Feng County, Shaanxi Province. In 1963, Jiang Chunfa and others discovered the early Triassic ammonoids for the first time in this set of strata, thus changing the age to the Early Triassic, and in 1966, they divided this group into Xipo Fm and Renjiawan Fm from bottom to top. In 1968, the 15th Division of the Survey Team of Shaanxi Geological Bureau used these two names for the first time, and the Xipo Fm and Renjiawan Fm were used to represent the flysch deposits of the early and late Early Triassic in Fengxian area, Shaanxi Province. In 1979, Jiang Chunfa et al made a detailed division of its sedimentary formation.

Synonym:

It is a sedimentary cycle composed of thick to middle calcareous siltstone, calcareous rice rock, calcareous fine sandstone and gray thin bed limestone, silty limestone, strip limestone, clastic limestone and pebbled limestone. Oblique bedding and hieroglyphic impression are well developed. Thickness of 3194 m and no peak.

Ammonoid fossils Anasibirnites sp.

It is interpreted as turbidity current deposit