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The flysch was derived from the southeastward progressing Longmenshan nappes of Indosinian age (Late Triassic: 227 to 206 Ma), related to the collision between Tibet and the western margin of the Sichuan carbonate platform.
This picture: The Longmenshan, the first rise to Tibet, as seen from Jiangyou, the work destination in the Sichuan basin (160 km to the northeast of the provincial capital Chengdu).
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