Changsha, located in the east of Hunan Province, has a long history and is known as the hometown of Qujia, the famous city of Chu and Han, and the Xiaoxiang bamboo silk. Today, Changsha has developed into the city with the best international image and is also known as the "media art capital" of the world. Changsha has many famous scenic spots, such as Yuelu Mountain, Orange Island, Window of the World, Xiangjiang Happy City, Hunan Provincial Museum, Beizheng Street and so on.

Changsha, alias Xingcheng and Tanzhou, is located in the middle of China, downstream of Xiangjiang River, west of Changliu Basin and northeast of Hunan. It is adjacent to Yichun and Pingxiang in Jiangxi in the east, Zhuzhou and Xiangtan in the south, Loudi and Yiyang in the west and Yueyang and Yiyang in the north. The urban area is about 230 kilometers long from east to west and 88 kilometers wide from north to south.

Introduction of geological characteristics of Changsha city;

The geological characteristics of Changsha are: the strata are completely exposed, the granite bodies are widely distributed and the geological structure is complex. Various geological and historical strata are exposed in Changsha, and the oldest stratum was formed about 1 100 million years ago. About 600 million years ago, Changsha was still a sea of Wang Yang, but the sea was not deep. After that, the sea gradually withdrew from east to west, and most areas of Liuyang, Changsha and Wangcheng surfaced, becoming the northwest edge of Jiangnan ancient land.

About/kloc-0.40 billion years ago, the seawater immersion in Changsha area ended and rose to land. Due to the influence of crustal movement and geological structure, a long-strip intermountain depression basin-Chang (Sha) Ping (Jiang) basin has been formed. Since Cenozoic, the whole Changping basin has risen to land. About 3.5 million years ago, the third ice age occurred on the earth, and Liuyang preserved the remains of glacial landforms.