Fig. 2From: Microscopic weathering mechanisms of subflorescence and crust patterns in the Nankan Grotto, northern Sichuan, ChinaField observations and sampling sites of the different deterioration patterns in the Nankan Grotto. a, b Subflorescence site. c Efflorescence site. d–f Crust site. The red dots in a and d denote the drill sitesBack to article page