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.
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。
2
Neotectonic movement is active, since the epipleistocene active fault zone has had 24 to be many, the predominant direction of fault zone by NW and NWW to primarily.