Xikeng Formation

The Xikeng Formation is located in Xiushui County, Jiangxi Province, and contains alternating beds of purplish red, grayish green and yellow green sandy and muddy rocks. The Xikeng Formation is dated to the Late Silurian - Early Devonian period.^[2]

Xikeng Formation
Stratigraphic range: Telychian–Early Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Xiaoxi Formation
Overlies	Xiajiaqiao Formation[1]
Lithology
Primary	Sandy mudstone, siltstone
Other	Sandstone
Location
Location	Xiushui County
Region	Jiangxi Province
Country	China

A new outcrop was identified within Baishui town in 2025 which extended the age of the Xikeng Formation to 436 million years ago.^[3]