早/晚二叠纪沉积了2500厚的冲积和风积砂岩及蒸发岩（赤底统），随后是1500厚的二叠系最上部蒸发岩和碳酸盐岩（镁灰岩统）。
B / Late Permian deposition of a2.5km thick alluvial and wind sedimentary rock and evaporates ( red bottom systems ) Followed by a1.5km thick Permian top of evaporates and carbonates ( magnesium limestone system ) .
赤底统