No.12

Located between the large grassland and the great fire ground in Mu’erzhai Valley, exposed to a height of 15m and width of 20 m. The pillows are pillow-shaped, ellipsoidal, and vesicular, with sizes ranging from 30 cm to 40 cm in width and 50 cm to 80 cm in length. Locally, there are amygdaloidal and vesicular structures. Pillow basalt formed in an underwater environment, distinct from the columnar joints formed by terrestrial eruptions.