Yanbian Gr
Period:
Neoproterozoic
Age Interval:
Qingbaikouan (Tonian), Qb (44)
Province:
Sichuan
Type Locality and Naming
Southernmost Sichuan. The Yanbian Gr was named by Chang Longqing in 1936. The naming locality is Yanbian County, Sichuan Province.
Synonym: （延边群）
Lithology and Thickness
The group includes the following formations from bottom to top; Huangtian Fm, Yuman Fm, Xiaoping Fm and Zhagu Fm. Please see the description of each formation for their lithologic character. The Group is over 6000 m thick.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
The bottom is not seen.
Upper contact
The top is covered by the Nanhuan Lieguliu Fm with a disconformity.
Regional extent
Southernmost Sichuan. It is developed in Yanbian County, Sichuan Province.
GeoJSON
null
Fossils
Age
Qingbaikouan (Tonian)
Age Span:
Beginning stage:
Tonian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
1,000.00
Ending stage:
Tonian
Fraction up in the ending stage:
0.8
Ending date (Ma):
776.00
Depositional setting
Depositional pattern:
Additional Information
The Yanbian Gr yielded a SHRIMP U-Pb date of 782±53 Ma (Du Lilin et al., 2005).
Compiler:
Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.