2012 a peak year for archaeologists

3. Liujiazhai Neolithic Site in Jinchuan county, Sichuan province, belongs to late Neolithic Age

From the Neolithic Liujiazhai site in Sichuan province [Photo/Xinhua]

4. Shimao Ruins in Shenmu county, Shaanxi province, from late Longshan Period (about 2350 to 1950 BC) to Xia Dynasty (c.21st century-16th century BC)

Pottery tripod vessel found in Shenmu, Shaanxi province [Photo/Xinhua]