Effects of volcanic activities in Ordovician Wufeng-Silurian Longmaxi period on organic-rich shale in the Upper Yangtze area, South China |
Lanyu WU,Yongchao LU,Shu JIANG,Xiaofeng LIU,Guisong HE |
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Fig. 7. Biological characteristic of bentonite rich interval. (a—d) Major biotic species of dense bentonite interval in the TST1. (a) Deunffia sp., Wulong section; (b) Cornutosphaera sp., Wulong section; (c), (d) Radiolarian, LY1 well, 2 833.22 m; (e—f) Major biotic species of sparse bentonite interval in the TST2; (e) Sponge spicules, JY1well, 2 402.55 m; (f) Graptolite with diversity of species show random orientations in the TST2, PY1well, 2 152 m. |