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A striking feature of western Tian Shan is the large number of basins containing Cenozoic rocks, prominent basins include the Fergana Basin in the southwest, the Issyk-Kul Basin in the east and Naryn Basin in the south. [16] On the edges of the Tian Shan, there are foreland basins with Cenozoic sediments several kilometers thick.
The Tian Shan, [note 1] also known as the Tengri Tagh [1] or Tengir-Too, [2] meaning the "Mountains of God/Heaven", is a large system of mountain ranges in Central Asia. The highest peak is Jengish Chokusu at 7,439 metres (24,406 ft) high.
Two eruptions are known from Tianshan, in 50 AD (± 50 years) and 650 AD (± 50 years). The book, Aspects of Nature in Different Lands and Different Climates, Volume 1, reports that Pechan cone sent out streams of lava in the seventh century.
The geology of Kyrgyzstan began to form during the Proterozoic. The country has experienced long-running uplift events, forming the Tian Shan mountains and large, sediment filled basins. [ 1 ]
The Dunhong Mountain according to Classic of Mountains and Seas, is a mountain of the Tian Shan range. This mountain has been proposed to be the homeland of the Yuezhi. According to archaeologist Lin Meicun, this is the Dunhuang (Chinese: 燉煌) mentioned in the Shiji by Sima Qian, which states that:
Chatkal Range is a range in the Western Tian Shan that borders Ferghana Valley from northwest. It departs from Talas range and spreads out to south-west to the right bank of Angren (river) . The length of the range is 225 km (140 mi), and it is up to 30 km (19 mi) wide.
The Tian Shan are a mountain range north of the Tibetan Plateau and the Taklamakan Desert. Uplift of these mountains began 24 million years ago. It was a direct response to the continued extension of the Indian collision zone. The mountain range is still uplifting today along with the Himalaya. [9] [10]
The Kakshaal Too lies within the southern Tien Shan and formed during the Hercynian orogeny. Structurally, it consists of a mega-anticlinal formation trending northeast. It is mainly composed of limestones, siltstones, sandstones, conglomerates, and argillites of Paleozoic intruded by granites, granosyenite, and syenite. [2] [1]