Research Article
Isotopic Age of the Xiong’er Group Volcanic Rocks and Its Geological Significance in Western Henan, China
Figure 8
Formation age pedigree chart of volcanic rocks in the Xiong’er Group. Data source: this paper, [1, 8, 22–24]. Note: the southern margin of the North China Craton is divided by Sanmenxia-Fangcheng-Xinyang. The west is the Ronan Basin, and the upper strata of Xiong’er Group are the Guandaokou Group. The eastern is the Ruyang Basin, and the upper strata of Xiong’er Group are the Ruyang Group.