Since early 1970s, the age of the Jingbei limestone (ancient buried bill, Damintun depression, Liaohe rift) has been considered to belong to the Mesoproterozoic Changchengian.

• 摘要辽河断陷大民屯凹陷静北灰岩古潜山的地层时代，在上世纪80年代初期被认为属于中元古代长城纪。