Tieyegou Fm
Period:
Jurassic
Age Interval:
Middle Jurassic, J2. (27b)
Province:
Gansu
Type Locality and Naming
It was named by Wang Yuelun as Tieyegou Red Sandstone Series in 1948. The naming section is located on the North Hills of Tieye Gully (eastern wing of the Mawangmiao Syncline) 2 km south of Agan Township, Gaolan County (ca. 36.3N, 103.9E), Gansu Province.
Synonym: （铁冶沟组）; Tiehyehkou Fm
Lithology and Thickness
Its lower part is composed mainly of grey-green and purple clayey shales, intercalated with sandstone, while its upper part is composed of red sandstone, conglomerate and clay beds, with a thickness of 100-150 m.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
It overlies conformably the Yaojie Fm (Aganzhan Fm).
Upper contact
Implied by regional situation that the next younger unit is the Xiangtang Fm.
Regional extent
It is distributed in the area of Agan Township, Lanzhou City.
GeoJSON
null
Fossils
Age
Uncertain; for graphic purposes, placed here as coeval with the lower portion of the Xinhe Fm in similar stratigraphic position (Column TJ27a).
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
169.54
Ending stage:
Bajocian
Fraction up in the ending stage:
1.0
Ending date (Ma):
168.17
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Jingeng Sha (coordinator)