In a quiet valley in Beijing, there is a volcano. Do you know that?/You know what?

Recently, the submarine volcano in Tonga, a South Pacific island country, erupted. Although the extent of this volcanic eruption is still unknown, judging from the pictures taken by satellites, it will definitely bring serious disasters to mankind. According to the situation of volcanic activity, it can be divided into active volcano and dead volcano. Speaking of volcanoes, many people think that there is no volcanic geology in Beijing, and people who like to travel go to other places to see volcanoes. In fact, in Beijing, there is a place where you can observe the remains formed after the volcanic eruption at close range. This is the "Sanyang Ancient Volcano" located in the south of Huayu Village, Xiong 'erzhai Township, northeast of Pinggu District 19 km.

The total area of this volcano is 10 square kilometer. Formed/kloc-0.5 billion years ago, it broke out in prehistoric times, but it never broke out again. It is an extinct volcano that has lost its activity ability, but it still maintains a complete volcanic shape. It is an ancient volcanic resource with high rarity, ornamental value and popular science value in Beijing, one of the oldest volcanoes in Beijing and even the whole country, and the only one in Beijing.

The geology formed after volcanic eruption has caused many large and small rift valleys and narrow valleys in Sanyang ancient volcanic area, so there are many strange peaks and rocks. Due to the volcanic ash formed by Sanyang ancient volcano, fertile soil has been formed here, making the vegetation coverage rate here reach 90% and the forest coverage rate reach 60%. In addition to the unique natural landscape, there are 65,438+10,000 walnut trees and patches of hawthorn trees from the foot of the mountain to the roadside. The "volcanic red fruit" produced here is very famous and has the reputation of "Gai JD". COM”。 Besides walnuts and red fruits, there are many kinds of red pears around Sanyang ancient volcano. Along the mountain road, there are wild vegetables such as dandelion, Gracilaria lemaneiformis and magnolia buds everywhere, which are absolutely green and natural. Sanyang ancient volcano has now been developed into a scenic spot. The scenic spot is picturesque, with five steps and a small scene, and ten steps and a big scene. The five-mile-long canyon is a combination of mountains, water, valleys and rocks, and contains rich tourist attractions, with more than 65,438+000 tourist attractions. The ancient volcano scenic area covers an area of 26 square kilometers. The mountain peaks are towering and covered with green umbrellas. The highest peak is 890 meters above sea level. There are three unopened primitive ancient volcanic eruptions and blowholes 65.438+0.5 billion years ago, and there are very vivid natural landscapes such as turtle blessing, mountain protection and ancestor peak. The main landscapes are:

Volcanic pagoda

1, Volcanic Stone Pagoda, at the cliff of the mountain, there is a tower-shaped stone pillar shaped like artificial masonry, named "Volcanic Stone Pagoda", which is a natural landform phenomenon formed by weathering after volcanic eruption for more than one billion years.

volcano fumarole

2. Longyan Tiankeng (volcanic spray hole). Volcanic eruption will release a lot of gas, and the gas will be ejected from the nozzle. This spray hole used to be one or two kilometers deep. After more than one billion years of sediment deposition, it is now less than ten meters deep. Because there is an elm tree that looks like a dragon next to it, it is named "Yulong Tiankeng".

volcanic vent

3. Crater, in the winding valley of "Baiyang Road", there is a small pond, surrounded by stone tablets, small observation platforms, shrubs and weeds. 65.438+0.5 billion years ago, this was the crater where volcanic rocks melted and erupted.

natural bridge

4. Tiansheng Bridge, with a width of about 4m, a height of 2m and a span of15m. If it rains, it will form a waterfall, which is particularly spectacular. It is a geological product formed by long-term erosion of rocks by rivers. Geologists infer that its age was before the volcanic eruption, probably1800 million years ago.

Tianhu

5, Tianhu and Pine Forest Slope, along the mountain road, you can also see the naturally formed Tianhu and thousands of acres of pine forest, and the scenery is beautiful.

Pangushi

6. Pangu Stone, a "quartzite sandstone" 65.438+0.8 billion years ago, witnessed the origin of species in a long time.

Shiyuniangzi

7. The barren woman's child is a natural pattern appearing on the crack surface of a boulder, like a young mother gazing at her baby affectionately.

Australopithecus welcomes guests

8. Australopithecus welcomes guests and suddenly narrows the "Longmen" in the canyon. From here, like a giant ape crouching in front, this is the "Australopithecus Peak", and the landscape is called "Australopithecus welcomes guests".

Shanliushi

9. Alpine rocks and cliffs are weathered and collapsed, and the falling rock fragments gather into a gravel flow and pour down from the ridge like a waterfall.

Look at Buddha and Fengtai.

10, there is a wooden pavilion on the roadside slope, called "Looking at the Buddha and Watching the Phoenix". It is said that it stands in front of the pavilion and looks at the distant mountain, like a reclining Buddha, while the mountain on the right front is like a phoenix.

A century-old pear tree in Xiao Hong

1 1, a Xiao Hong pear tree with a history of more than 100 years. In its vicissitudes of life, there are nine winding branches stretching out, flourishing and fruitful. Red pears have the effect of relieving cough and asthma, and there is a folk saying that "eating red pears and touching red fruit trees is blessed with health"

Plum blossom raindrop mark

12, plum blossom raindrop mark, is a timely sandstone covered with rust. The reason for its formation is that there used to be a large number of small nodules composed of siliceous, argillaceous and iron in the sandstone. Due to long-term weathering, mud is eroded and iron is oxidized, which is manifested as rust on rocks, especially in rainy days.

All kinds of rocks formed after volcanic eruption are very suitable for close observation by friends who like geology.

The roads in the scenic spot are gentle and flat, suitable for the elderly and children to walk. The rugged rocks along the way are far different from ordinary valley attractions, especially suitable for tourists interested in geology. Transportation route: Bus: Take the 9 18 Express 9 18 branch Pinggu1Road Pinggu 3, Pinggu 4, Pinggu 5 and Pinggu 8, get off at Pinggu District Hospital and transfer to Pinggu 12 at Xiong 'erzhai. Self-driving: Jingping Expressway-Pinggu City (Sanhe, Gaodong Village) Exit-Changguan Building (go straight at the intersection)-Xiongerzhai Tourism Center (gas station) 100 meter turn right.

Friends who go to play, because during the epidemic, don't know whether the scenic spot is open, you should ask in advance.