Tabo Fm
Type Locality and Naming
The type section is located at Weizigou of Tabo, south of Lueyang County, Shaanxi. The reference section is between Heyeba and Lingyansi of east bank of Jialingjiang River in Lueyang County. It was named by Shanxi Regional Geological Survey in 1961, and Du Dinghan et al. quoted it formally in 1986.
Lithology and Thickness
Conglomerate. The formation is composed of gray and variegated conglomerate, pebble-bearing arkose, calcareous arkose and lithic sandstone, with interbeds of dark-gray and greenish-gray sandy slate.
There is a fault in the middle part of the section, the bed succession is not completely outcropping, and the outcropping thickness is more than 536 m.
Relationships and Distribution
Lower contact
It unconformably overlies the Silurian Bikou Gr.
Upper contact
The top is an angular unconformable contact to the overlying Upper Devonian Heyeba Fm of black and gray thick-bedded quartz sandstone.
Regional extent
This formation is only distributed in Tabosi to Baiquesi area of Lueyang County.
GeoJSON
Fossils
In the calcareous arkose of the middle and upper parts are found coral of tabulata Coenites and bryozoan fragments.
Age
Depositional setting
Additional Information
The Tabo Fm roughly corresponds to the age of Sanhe Group north of Lueyang to Guozhen, although the lithological characteristics and sedimentary facies show a considerable difference.