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Why is the Sichuan Basin sometimes called the Red Basin?
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Sichuan
Highlands of Sichuan province, China.
The Sichuan Basin is frequently referred to as the Red Basin (or Hongpen) because it is underlain by extensive deposits of red-to-purple sandstones and shales. The region is characterized by these red-brick sandstone formations, which define much of the basin's geological composition.123