Table 1. List of Clay and Mineral Contents of the Wufeng Shale.

	mineral content (%)					clay content (%)
sample	quartz	calcite	plagioclase	dolomite	total clay	illite	kaolinite	chlorite
Wufeng–Longmaxi shale	33.5	17.3	1.5	36.2	11.5	94	2	4