Pillar-Shape Joints-The Unique Structure of Geological Evolution

In Tengchong, the pillar-shape joints that comprise olive basalt are terraces of lava overflowing from volcanic crevices, and the joints are scattered in the river valleys and the basin.

The overflowing lava is great in volume and fast in flowing, so it can extend 10 square kilometers in general, sometimes even to 40 square kilometers with average thickness of 30 to 50 meters, and the thickest over 200 meters, thus making the terrace look like piles of logs.

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