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32-650: The Jialingjiang Formation (嘉陵江组) is a geologic feature associated with the Sichuan Basin of China, generally underlying the area of the basin, with its origins dating to the Early Triassic period of geologic time, around a quarter of a billion years ago, and before. The Jialingjiang Formation is a geologic group feature upon the Yangtze Plate , which is a tectonic feature of the Earth's crust . The Jialingjiang Formation

64-674: A governor of Shu (present Sichuan Province ) in the Qin state with his son directed the construction of Dujiangyan. Li Bing gave up the old ways of dam building, which were simply directed at flood control, employing a new method of channeling and dividing the water of the Min River . He accomplished this by separating the project into two main parts: the headwork and the irrigation system. The whole system has functioned for 2,000 years, preventing floods and providing substantial irrigation and facilitating shipping and wood drifting. It has contributed greatly to

96-545: A population of 710,056 in 2020. Dujiangyan was formerly a county named Guanxian or Guan County ( 灌县 ; 'irrigation" county'). The county became a county-level city in 1988 and was renamed after the Dujiangyan Irrigation System , in the city's northwest, famous for providing Chengdu with water for over two millennia, since around 250 BC. Around 250 BC during the Warring States period , Li Bing ,

128-597: Is also of interest in history as it has been a source for humans to extract valuable economic goods such as salt and natural gas for many centuries. The history of the Jialingjiang Formation explains the origins of the hydrocarbon resources which have historically or in the future may be extracted. The primary hydrocarbon resource of the Sichuan Basin is natural gas . Sichuan Basin The Sichuan Basin

160-535: Is an expansive 229,500 km (88,600 sq mi) lowland region in China that is surrounded by upland regions and mountains. Much of the basin is covered in hilly terrain. The basin covers the eastern third of Sichuan Province and the western half of Chongqing Municipality . The westernmost section of the Sichuan Basin is the Chengdu Plain , occupied by Chengdu , provincial capital of Sichuan. The Chengdu Plain

192-683: Is evidenced at its margins. Orogeny formed by the Indian Plate 's collision with Eurasia has compressed against the Sichuan Basin's western edge, most notably along the Longmenshan Fault , the epicenter of the 2008 Sichuan Earthquake . The basin's rigidity withstands much of the Tibetan Plateau's eastern movement, but dramatic folds have formed within the Yangtze Plate along the Sichuan Basin's eastern edges. Here, ancient faults interact with

224-470: Is important to paleontologists or other people interested in ancient life forms due to the fossil evidence incorporated therein (such as for Eretmorhipis and other Ichthyosaur relatives). Also, scientific study of this formation group provides insight into Late Triassic tectonic inversion based on analysis of detrital zircon U–Pb chronology (involving the element uranium converting to lead over time due to radioactive decay ). The Jialingjiang Formation

256-538: Is largely alluvial , formed by the Min River and other rivers fanning out when entering the basin from the northwest. This flat region is separated from the rest of the basin by the Longquan Mountains . The central portions of the Sichuan Basin are generally rolling, covered by low hills, eroded remnants of the uplifted Sichuan Basin floor . In some parts of the extreme northern Basin and in Weiyuan County in

288-441: Is said to have been utilized by the Qin to first conquer the Sichuan Basin in 316 BC. Transportation to the west from Sichuan has proven to be an even greater challenge, with steep mountains and deep valleys hindering movement. Nevertheless, the Sichuan Basin has played a role as a stopover on the southern Silk Road and provided the most direct route between India and China. The southern trade route to Tibet also passed through

320-521: The Daba Mountains , themselves a result of pressure between the Yangtze and Eurasian Plates in a perpendicular direction. Until 6 million years ago, a large lake filled the Sichuan Basin. The basin's soils today are largely exposed red sandstone, leading to the "Red Basin" nickname for the region. The Sichuan Basin's well preserved Jurassic layers have proven valuable to paleontology , such of those of

352-480: The Daba Mountains evergreen forests to the northeast and east. Previously only known in fossils and thought to be extinct, the Dawn Redwood ( Metasequoia glyptostroboides ) was rediscovered in 1943 in the hilly Lichuan County , on the eastern mountain fringe of the Sichuan Basin. The Dawn Redwood is distinctive because it is a deciduous conifer. Relative to the areas surrounding the upper Yellow River and

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384-550: The Min River , which enters the basin from the northwest at Dujiangyan City and flows southerly to meet the Jinsha at Yibin where together they form the Yangtze in name. The Dadu River enters from the west and joins the Min at Leshan . The Sichuan Basin forms the rigid northwest edge of the Yangtze tectonic plate . The Yangtze Plate's complex relationship with the surrounding Eurasian Plate

416-482: The North China Plain , the Sichuan Basin has played a peripheral role in the development of Chinese civilization . Due to the fertile agricultural characteristics of the basin, numerous cultures developed prior to integration with ancient Chinese dynasties. No written records exist from early cultures in the Sichuan Basin. What little is known about the area is from when contact was made with Shang and Zhou and from

448-539: The Qin Mountains to the north. The basin was also connected with Yunnan to the southwest in 1970 , Hubei to the east in 1979 , and Guizhou to the south in 2001 . In the 21st century, many high-speed rail lines have been built or planned for the Sichuan Basin including the Chengdu-Guiyang and Chengdu-Xi'an lines. Highway construction within Sichuan Basin intensified in the 21st century. Expressways through

480-481: The Shaximiao Formation , near Zigong , which preserves abundant remains of dinosaurs and other prehistoric animals. Originally, the Sichuan Basin was covered by the Sichuan Basin evergreen broadleaf forests . With human settlement, agriculture has taken root across most of the fertile basin and reduced the original forest to small patches on hills and mountains including Mount Emei . The extensive ridges in

512-715: The Tuo River , the Fu River , and the Qu River . Due to the surrounding mountains, the Sichuan Basin often experiences fog and smog as a result of temperature inversion caused by the basin's convective layer being capped by a layer of air moving east across the Tibet Plateau. A moist, often overcast, four-season climate dominates the basin, with cool to mild winters occasionally experiencing frost, and hot, very humid summers . The intensity of summer varies rather widely throughout

544-562: The Basin. Sichuanese cuisine today is renowned for its unique flavours and levels of spiciness. The Sichuanese branch of Mandarin Chinese is barely mutually intelligible with Standard Mandarin and originated in the Sichuan Basin. Today, Sichuanese is spoken throughout eastern Sichuan province, Chongqing, southern Shaanxi , and western Hubei . While transportation across the Sichuan Basin has been facilitated by relative flatness, access to and from

576-460: The Sichuan Basin include Guangyuan , Mianyang , Deyang , Nanchong , Guang'an , Dazhou , Ya'an , Meishan , Leshan , Ziyang , Suining , Neijiang , Zigong , Yibin , and Luzhou . The former cities of Fuling and Wanzhou are now considered districts within Chongqing, but maintain their status as separate urban centres along the Yangtze. Some unique elements of Sichuanese culture remain in

608-528: The Sichuan Basin was at the centre of another independent Shu State , until it was reunified with China in the 3rd century CE by the Jin dynasty . Around this time the basin's population is estimated to have been 1 million, with Chengdu the leading city. After the collapse of the Tang dynasty in 907, the Sichuan Basin became home to a third Shu state , this time lasting only two decades. During successive Chinese dynasties,

640-487: The Sichuan Basin was firmly integrated with Greater China . Mass migration occurred during the Ming dynasty as the basin became one of the primary rice-producing regions of China. The basin's population fell sharply in the 17th century due to devastation caused by famine, war, and possible genocide. After this time, the basin was repopulated with emigrants from China, further assimilating the unique cultures and peoples inhabiting

672-489: The Wu Mountains to the east. Dujiangyan City Dujiangyan ( Chinese : 都江堰 ; pinyin : Dūjiāngyàn ) is a county-level city of Sichuan Province , Southwest China , it is under the administration of the prefecture-level city of Chengdu . Its north-west region forms a border with southern Ngawa Tibetan and Qiang Autonomous Prefecture . It has an area of 1,208 km (466 sq mi) and had

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704-564: The archaeological site of Sanxingdui . Predominant among the known ancient cultures was the Shu State that was independent from the Zhou until it was strategically conquered by the Qin in 316 BCE during the Warring States period . The Sichuan Basin was integrated into Imperial China under Qin dynasty for whom it was an important agricultural resource. During the period of the Three Kingdoms ,

736-605: The basin has long been a challenge. Chinese poet Li Bai once claimed that the road to Sichuan was "harder than the road to heaven". Until the construction of the Three Gorges Dam , the Yangtze River was the primary transportation corridor. Connecting the basin with the Yellow River valley to the north, the 4th century BCE Shu Roads were an engineering feat for their time. Most famously, the semi-legendary Stone Cattle Road

768-549: The basin include the G5 , G42 , G50 , G65 , G75 , G76 , G85 , and G93 . All expressways that connect the Sichuan Basin with other parts of China have been designed to utilize a series of tunnels and bridges to cross the mountainous surrounding terrain. Notable examples include the 18 km (11 mi) long Zhongnanshan Tunnel through the Qin Mountains to the north and the 500 m (1,600 ft) high Sidu River Bridge through

800-566: The basin is the petroleum industry, currently exploring and extracting from oil reserves locked under the eastern parts of the basin. While population growth stagnated during the Great Leap Forward, it has since recovered. Today, the basin has a population of approximately 100 million. Administratively, the entire basin was part of Sichuan province until Chongqing was separated into a provincial-level municipality in 1997. In addition to Chengdu and Chongqing, significant cities found within

832-513: The basin, depending on location. Generally, the climate is warmer and wetter in the eastern parts of the Sichuan Basin. The basin's climate is classified as humid subtropical under Koppen classification. The entirety of the Sichuan Basin is drained by the Yangtze River and its tributaries. The main stem of the Yangtze, the Jinsha River , enters the basin in the south at Yibin where it meets

864-594: The basin, eventually crossing Kham and the Derge Kingdom to the west. The Long March passed to the west of Sichuan Basin in 1935 with great difficulty. In the 20th century, the Sichuan Basin was connected to the rest of China by railways. The Chengyu Railway , completed in 1952, connected Chengdu and Chongqing within the basin. The first rail link to outside the basin was the Baoji–Chengdu Railway , completed in 1961 to connect with Shaanxi province across

896-578: The basin. During the Second Sino-Japanese War when much of Eastern China was occupied by Japanese forces, Chongqing in the Sichuan Basin served as the Republic of China 's capital. Owing to its vast fertile plains, the Sichuan Basin has long supported a high concentration of human population. The major population centres of Chengdu and Chongqing have flourished with their hinterlands providing staples such as rice, wheat, and barley. Irrigation in

928-454: The corridor between Chengdu and Chongqing have become developed as an economic centre known as the Chengyu Area. This area is mostly coterminous with the basin; it is part of a branding scheme by the Chinese government to attract investment to the area. Chemical, textile, electronic, aerospace, and food industries have all been developed as part of the Chengyu Area. Another emerging industry in

960-521: The eastern Sichuan Basin preserve elements of the original forests. A greater variety of natural landscapes and wildlife have been at least partially preserved in the mountains surrounding the basin where human settlement has been less intensive. The natural ecosystems of these mountains have been classified by the World Wide Fund for Nature as the Qionglai-Minshan conifer forests to northwest and

992-471: The southwest, there are ancient dome-shaped low mountains in their own right. The Jialing River enters from the north and flows across the entire width of the Sichuan Basin to meet the Yangtze at Chongqing. Northeast of Chongqing, the Yangtze cuts an outlet through the mountains at the eastern edge of the basin known as the Three Gorges . Other significant rivers almost wholly within the Sichuan Basin include

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1024-414: The western part of the basin has been controlled for over two millennia by the monumental Dujiangyan irrigation system , where the Min River enters. The region has been known as a major breadbasket of China, especially in the 20th century during times of war. Sichuan Basin also became a major focus of industrial development during Mao 's Great Leap Forward . In more recent times, the Sichuan Basin and

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