Causes of skylight in Jiudun, Guangxi

The reason for the formation of skylight in Jiudun, Guangxi was formed in carbonate strata of Maokou Formation and Qixia Formation of Lower Permian, and it was formed after the sinkhole collapsed.

It consists of four skylights, all of which are inclined skylights. The hole is slightly circular, with a diameter of13.5-25.7m, and the skylight depth is over 35m (excluding water depth) and the water depth is over100m.

In the normal wet season, the Tianguang Formation has a large overflow, ranging from 0.7 to 4 cubic meters per second, and the overflow converges into nine lakes. The lake is wide, with a length of175m, a width of 23-108.5m and a water depth of10-30m.

During the rainy season, the flood surged and flooded the whole valley. It is one of the main sources of Chengjiang River and is known as the underwater Mount Everest in China. 20 13 Australian wet mule expedition arrives in Daxing, Du 'an. The purpose of their trip is to explore the mystery of Daxing Nine-Sky Window and find the bottom of the skylight. On March 20th, they spent six hours exploring the nine skylights, which inadvertently broke the previous record set by Mia, the world ice diving queen.

Swim to the depth of 203 meters, and connect the south hole and the north hole of Jiudun skylight at the underwater position of 1 12 meters to find an underground river channel. On 23rd, they dived to a depth of 2 12m again, setting a new record for cave diving in China.

I heard a long time ago that there is a flowering river in Duan, Guangxi. This river is Chengjiang, and "flower" is cauliflower, also called "Xiaoyao De". Many people have eaten in Dali or Lijiang, but they don't know the name. Now we know that this kind of flower also exists in Guangxi.