Bu Xiaoxin retorted with a smile, "If it was really so easy for you to discover, then the secret of the drowning pool would have been unearthed a long time ago." None of the emperor's tombs are easy to find, and I'm afraid there are some forks in the road that are difficult to find. ”

"Quite possibly!" Photographer Qin Han laughed and waved his camera, "If you find a treasure, you will pay it to the state, and the state will compensate you." My daughter finally has the money to study abroad! ”

"Don't think it's too pretty." I glanced around faintly, and my cold gaze swept over everyone, "Don't forget the original purpose of our indrowning pool." It doesn't matter if it's a mausoleum or anything else. One thing is clear, it's dangerous. There must be a mysterious and strange force guarding it. ”

"That's right, you can't run away, and if you don't deserve you, you will lose it even if you get it. Let it be, let's go! Yijiang quickly recovered from his excitement and ecstasy and patted Yingshan on the shoulder hard.

Yingshan still smiled brightly, his excited hands were shaking, and he calmed down for a long time before he played the role of a guide.

The passage to the sub-well is on the southeast side of the cave wall and is small enough to be dived through. I bit down on the small oxygen cylinder and lined up behind Shi Yueying and entered the water.

The mysterious veil of the indulgence pool finally gradually reveals its true face to us, as well as its sharp minions......

Cave, or cavity. According to the definition of the International Association of Speleology, a cave is a natural underground space that can be accessed by people.

Caves are an important part of the earth's natural landscape, and they are also a unique natural resource, which is closely related to human production activities. The science that studies its formation, morphological characteristics, development and evolution, and exploitation is speleology, which is called speleology in English. In the mainland, especially in the karst mountainous areas of southern China, the investigation, exploration, formation, development and utilization of caves have great theoretical significance and socio-economic value.

But there are not many famous caves near the city. Although the indulgence pool is famous, it is famous for its promise, and as for whether the passage between the two wells is a cave, few people think about it, and few people think to explore it.

Yingshan was the first to enter the cave of the drowning pool and walked out, which lasted 3 and a half hours. It can be seen that the passage between the two sub-wells of the indulgence pool is not difficult to walk, and even beginners can easily get their hands on it.

Speaking of caves, it is important to mention several of its major varieties. The others don't need to be introduced, after all, it doesn't have much to do with this book, and it's good to focus on a few related genres.

According to the definition of a cave, a cave is actually composed of two parts: the cave space (cavity) and the rock mass or (surrounding rock) around it. There are many types of caves, according to the nature of the surrounding rock formed by them, there are carbonate caves, formed by karstification, the most widely distributed in the continent, the largest number and the largest scale. Gypsum caves, the scale of the cave is generally not large, and the distribution is far less common than that of carbonate caves. Conglomerate caves, formed in calcareous cemented conglomerate, are few in number on the continent and generally not large in length. Basalt caves, formed by the differential cooling of magma erupted by volcanic activity in the flow process, are mainly distributed in the northeast of the mainland and the volcanic eruption area of Hainan. Sandstone caves, ice formed by differential weathering.

The cave between the mother and son wells of the submerged pond is a conglomerate cave with few distributions.

The seven of us swam out of the water and climbed a conglomerate platform, which was not big, only more than ten square meters. Where the light shines, I can see a narrow passage not far away, winding and bending, like leading to the depths of hell.

Yingshan was the last to come, and he had a thin rope of wool pinned to his waist, which was emitting a faint silver light. Shi Yueying pulled it and asked, "What is this?" ”

"It's a special plastic rope that is used to indicate where we are and prevent us from getting lost. One end of the rope was tied to me, and a section was nailed to the bottom of the mother shaft, so if I couldn't find my way, I could follow the rope back. I bought a length of five thousand meters, which is enough. Yingshan explained.

"It's so fine, won't it break?" She asked again.

"Of course not, it is a special plastic, which is very tough, extremely elastic, not easy to pull off, and it is difficult to be cut by sharp rocks." Eiyama wiped the water from his face with his hand and swept it around with the miner's lamp on his forehead. The whole cave wall is hideous with sandstone, and there are stalactites of different lengths dripping transparent liquid above the head, if the saliva of a certain terrifying beast "still hasn't changed here, it's still so indescribably terrifying!" ”

"Let's go, go on." Yijiang carried the device on his back, "I've seen the map you drawn, and the hole in front can basically be used, right?" ”

"Yes, the width and height of the cave are great for beginners, it's not difficult, and there's not much to climb." Yingshan nodded, and took out an iron pickaxe from his backpack, "I'll lead the way, everyone follow one by one, be careful of the cave wall, sometimes the sandstone can be so sharp that it can easily cut through the human body, and if you don't pay attention, you will be injured." ”

The crowd slowly entered the cave that was just enough to accommodate one person, Yingshan was in front, and Qin Han was behind. I walked unhurriedly in the middle of the line, surveying the cave walls as I went. Sandstone is formed by weathering, denudation, and accumulation of rocks in the basin through weathering, denudation, and transportation. The rock is made up of two parts: debris and gap filler. In addition to quartz and feldspar, detritals include muscovite, heavy minerals, cuttings, etc. Gap fillers include two components: cementation and detrital heterogroups. Common cementations are siliceous and carbonate cements. Heterogeneous components mainly refer to fine-grained clay or silty materials deposited at the same time as the detritus. The composition and structure of the gap filler reflect the geological tectonic environment and physicochemical conditions under which the sandstone was formed.

But from the sandstone here, I couldn't find any information about its geological formation. Bu Xiaoxin behind me also seemed to notice this, she poked my back with her finger, and whispered, "Xiao, do you think it's weird?" ”

Forget it, I know this shameful name, I can't recognize it, damn Shi Yueying!

I didn't turn my head, I just knocked off a piece and looked at it; "It's weird indeed."

"Yes, sandstone is one of the most widely used building stones. Buildings decorated with sandstone hundreds of years ago may still be as charming as they are still today. This kind of rock is characterized by sound insulation, moisture absorption, damage resistance, difficult weathering, water does not dissolve, the stone does not grow moss, and it is easy to clean. But look! She pointed to some of the stone's grayed plants, "These plants are dead, but they are clearly there." I'm afraid these sandstones are a bit out of character. ”

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