Erduanjing Gr
Type Locality and Naming
The second team of Gansu District Test was named in 1965. The named profile is located in the second fault well in Subei County, Gansu. In 1965, the second area survey team in Gansu named the red sediments in the Shanhujing area in Subei County, Gansu Province as the Upper Triassic Second Fault Well Group and the Middle and Lower Triassic. In 1969, the regional survey report of the Gansu Geological Bureau (1:200, 000) published the named section. In 1980, the Stratigraphic Table Compilation Group of Gansu Province changed the upper series to Shanhujing Group, and called the original Middle and Lower Triassic series as the second fault well group.
Synonym:
Lithology and Thickness
Mainly interbedded with purple-red and gray conglomerate, pebbly sandstone, sandstone, and siltstone. Lower part is purple-red layered conglomerate. Middle and Upper parts are purple-red and gray siltstone, and the interbedded gravel sandstone and conglomerate. 1600 m thick.
Relationships and Distribution
Lower contact
The lower part is in unconformable contact with the underlying Upper Permian volcanics of the Fangshankou Fm with a thick layer of purple-red thick bottom conglomerate.
Upper contact
The upper part is in conformity contact with the overlying Upper Triassic Coral Well Gr with purple-red and gray gravel sandstone. However, this is renamed as the Shanhujing Gr (see explanation in Type Locality and Naming).
Regional extent
This group is mainly distributed in Shanhujing to the second fault well in Subei County, and is scattered in Yujingzi in Jinta County. The thickness is reduced to 560 m.
GeoJSON
Fossils
Age
Depositional setting
It belongs to piedmont deposits.
Additional Information