Guanyinya Fm
Type Locality and Naming
Southernmost Sichuan. The Guanyinya Fm was named by Zhang Yunxiang et al., in 1958. The typical section is situated at Guanyinya, Huili County, Sichuan Province.
Synonym: （观音崖组）
Lithology and Thickness
The Guanyinya Fm is dominated by purple sandstone and shale intercalated with limestone and dolomite. The basal part often contains pebbly quartzose sandstone or fine conglomerate. Lower part consists of white massive quartzose sandstone, greenish yellow pelitic fine-grained sandstone and blue gray sandy shale intercalated with purplish red and greenish yellow shale. Middle part is bluish gray limestone and grayish purple dolomitic limestone. Upper part is purplish red, grayish purple and brick red sandy shale and fine-grained sandstone intercalated with grayish purple medium-to thick-bedded compact limestone. It has an unstable thickness from 20 to 600 m
Relationships and Distribution
Lower contact
It overlies disconformably the underlying Lieguliu Fm or overlaps on the Kaijianqiao Fm, Suxiong Fm, or even lower horizons or old rock bodies.
Upper contact
Schematic stratigraphic columns imply it is overlain by the Dengying Fm of upper Ediacaran.
Regional extent
It is mainly distributed in west and south Sichuan Province and east Yunnan Province
GeoJSON
Fossils
It yields microplants: Leiopsophosphaera pelucida, L. densa, Pseudozonosphaera asperella, Trachysphaeridium rude, T. cultum, T. simplex, T. laminaritum, T. hyalinum, T. planum, Lignum punctulosum, Polyporata obsoleta, P. microporosa etc.
Age
Depositional setting
The sequence is considered to have derived from the early transgression sediments after the Nantuo glaciation.
Additional Information