It is a crusty lava flow. The surface crust of the lava flow from the volcanic eruption forms network cracks with different directions due to cooling and shrinkage. Later, lava flows fill the cracks many times, eventually making the flat lava flow appear in an irregularly arranged polygon. Because this polygonal shape resembles a turtle’s back, it is called “lava turtle back structure”. This geological structure is rare in our country. There are at least three lava flow units in the turtle back structure of the Aershan volcano.
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