Waduo Fm
Type Locality and Naming
The Sichuan District Investigation Team named this formation in 1981. The named section is located in Waduo, Yahui County, Sichuan Province.
Synonym: A set of carbonate basic volcanic flysch clastic rocks in the Daofu area corresponding to this formation is named as Runiangu Fm by Sichuan Bureau of Geology and Mineral Resources (1987, 1: 200, 000 Kangding District report), and the Waduo Fm. and Runiangu Fm. are regarded as contemporaneous difference facies. Hou Liwei et al. (1991) used these two formations and their meanings.
Lithology and Thickness
Metamorphism sandstone is interbedded with dark gray thick layer massive silty sandstone and slate. The thickness of Waduo Formation is more than 2000 m and develops striated and banded structure, it is characterized by muddy flysch and turbidite deposits.
Relationships and Distribution
Lower contact
The dark gray slate at the bottom is in conformity with the underlying Zhuwo Fm of Upper Triassic, which is characterized with black and white sandstone and slate.
Upper contact
Conformable with the overlying Lianghekous Fm
Regional extent
This formation is mainly distributed in the areas of Yajiang and Xinlong in Sichuan Province, in the Luhuo, Daofu Fault Zone, the formation is composed of gray, gray-white breccia limestone, purple red bioclastic breccia limestone, dolomite interbedded with green basalt, basalt breccia and basaltic fused breccia, it forms the carbonate rock-basic volcanic flysch clastic rock hybrid rock band.
GeoJSON
Fossils
Breccia limestone contains a large number of brachiopods, corals, conodont, bivalves and gastropods. The time limit is from Silurian to Late Triassic. Late Triassic bivalves: Halobia pluradiata, H. superbescens, H. yunnanensis, H. yandongensis, Pergamedia eumenea, etc.
Age
Depositional setting
Muddy flysch and turbidite deposits
Additional Information