The Pre-Sinian Darezha Formation is widely exposed in west Mianning.
冕宁西部是康滇地区前震旦系出露较集中的地段之一。
2
The opening and closing history may involve three major stages: pre-Sinian, Paleozoic and Meso-Cenozoic.
开合历史分为前震旦纪、古生代和中、新生代三大阶段。
3
Based on analysis of auriferous and geochemical properties of the meta morphic rocks, the authors hold that the major elements related to gold mineralization were derived from the Pre-Sinian System.