晚白垩世信江盆地北缘及南缘边界断层附近发育冲积扇体系，中央洼陷区发育河流沉积体系。
Fluvial fan sedimentary system disposed at the edge of south and north basin; Braided river system disposed in the central basin in late cretaceous in Xinjiang.
合肥地区膨胀土形成于第四纪上更新世Q_3及其以前，属江淮冲积、洪积成因类型。
The swelling soil in Hefei zone was formed at the Q3 epipleistocene of the 4th subage or before. It belongs to the type of Huaihe alluviation and diluvion.
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