Dalinzi Fm
Type Locality and Naming
The type section of the Dalinzi Formation is located at the Dalinzi sea-beach, Jinzhou, Dalian, Liaotung Province (122°04’00”E, 39°04’21”N). It was remeasured by Hong Zuomin et al. from Liaoning Regional Geological Survey Team in 1991. In the type section, the formation is 108.70 m thick. The Dalinzi Formation was named by Zhang (1977). The name is derived from Dalinzi sea-beach in Manjiatan Township, Jinzhou District, Dalian City, southern Liaodong Peninsula, southern Liaoning Province.
Synonym: （大林子组）
Lithology and Thickness
The Dalinzi Formation in the type section can be divided into two parts. Lower part, 6.9 m thick, is characterized by clastic rocks, consisting mainly of arkose-quartzose sandstone and shale with conglomerate-bearing sandstone at base and with a layer of conglomerate, 0.3‒2 m thick, at the base. Upper part is characterized by varicolored evaporite rocks, 102 m thick, consisting mainly of purple and grey quartzose sandstone, alternated with sandy dolomite, and intercalated with greyish green and purplish red shale and with a layer of white calcareous dolomite at the top. The upper part bears also solution-collapse breccia.
Relationships and Distribution
Lower contact
The base conglomerate of Dalinzi Fm rests disconformably on the greyish white quartzose sandstone of the underlying Getun Fm
Upper contact
It is in disconformable with overlying Jianchang Fm. The upper boundary of the formation is marked by the lithological change from the greyish white calcareous dolomite at the top of Dalinzi Fm to dark grey rudaceous and arenaceous limestone of the overlying Jianchang Fm.
Regional extent
The Dalinzi Formation is exposed in the Liaoning-Jilin Area of North China Region, distributed sporadically in the area of southern Liaotung Peninsula of southern Liaoning Province. The thickness of the formation at the Beishan Hill in Jinzhou District is 82 m thick. However, at Zhaojiakanzi of Fuzhouwan, Jinzhou District, it is merely 12 m thick.
GeoJSON
Fossils
No fossil was found from the formation.
Age
Depositional setting
Additional Information