Zharinaya Fm
Period:
Triassic
Age Interval:
Late Middle Triassic (TJ43)
Province:
Xizang (Tibet)
Type Locality and Naming
Liang Dingyi et al named it in 1991. The named section is located on the western slope of Mayangpusha, Zada County, Tibet.
Synonym: Zharnya Gr
Lithology and Thickness
It is composed of black gray thin layer argillaceous microcrystalline limestone, marl and black limestone. Its thickness is about 15 m.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
The bottom boundary is marked by the initial appearance of dark gray medium-bedded banded argillaceous limestone, Conformable contact with the underlying Denggongka Fm.
Upper contact
Top boundary is marked by the final appearance of medium-bedded dolomite. Next younger unit is the Duorang Gr.
Regional extent
GeoJSON
null
Fossils
Ammonoids: Joannites-Protrachyceras zone. Bivalves: Daonella indica-D. lommeli zone
Age
Schematic stratigraphic section indicates it spans the Ladinian. [Coeval with Mangxiangyu Fm in same region; therefore for TSC-graphic, put as early Ladinian]
Age Span:
Beginning stage:
Ladinian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
241.46
Ending stage:
Ladinian
Fraction up in the ending stage:
1.0
Ending date (Ma):
237.00
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Zhang Shunxin, Zhou Ze and Tong Jinnan.