Tianba Fm
Type Locality and Naming
It was named by Zhu Zaoling, Ge Meiyu et al in 1977. The type section is near the 76 km milestone, by the road from Shashuliang to Dayanmen in Tianba, 70 km west of the Chengkou County in northeastern Chongqing Shi.
Synonym: (田坝组)
Lithology and Thickness
The formation, 151.6 m in thickness, is dominated by interbeds of greenish gray medium-to-thin bedded quartzose siltstone, silty mudstone and argillaceous siltstone.
Relationships and Distribution
Lower contact
It contacts conformably with the underlying Shuanghechang Fm
Upper contact
It contacts conformably with the overlying Dayamen Fm
Regional extent
It is exposed restrictedly in northeastern Chongqing Province.
GeoJSON
Fossils
It bears the Spirograptus turriculatus zone in the lower part and the Monograptus drepanoformis-Streptograptus sinicus zone in the upper part of the formation. Besides, it yields trace fossils and a small amount of trilobite, brachiopod, etc. in the upper part of the formation.
Age
Depositional setting
Additional Information