Shangjing area is a volcanic dome formed by volcanic in active Early Cretaceous,in which the volcanic beds are dipping out with ring fracture and subvolcanic bodies intrusion in late stage.

• 上井地区是一个中生代早白垩世火山穹隆。火山岩岩层围斜外倾,环状断裂发育,晚期有潜火山岩侵位。