Developmental characteristics and geological significance of the bentonite in the Upper Ordovician Wufeng - Lower Silurian Longmaxi Formation in eastern Sichuan Basin, SW China

WANG Yuman,LI Xinjing,WANG Hao,JIANG Shan,CHEN Bo,MA Jie,DAI Bing

Fig. 6. Photos showing the outcropped bentonite-rich members ③ and ④ in the Eastern Sichuan-Hunan and Western Hubei region and their GR peaks. (a) Photo of outcropped bentonite-rich member ③ on the Huangcao section in Wulong; (b) GR peak of bentonite-rich member ③ on the Huangcao section in Wulong; (c) Photo of outcropped bentonite-rich member ④ on the Guangwu section in Hefeng, severely weathered; (d) GR peak of bentonite-rich member ④ on the Hongyanxi section in Longshan.