 Similarly, in Qixia, 2.75–2.7 billion-year-old gneiss of Qixia Complex was seen.The rocks in both areas imply an early Neoarchean emplacement of granitoid and the eruption of volcanic rocks about 2.75–2.65 billion years ago.Shortly, a metamorphic event took place 2.65 billion years ago, which altered the rocks into gneiss and metamorphosed sedimentary rocks.