Refers to the period of the Zhou dynasty from ca. 1050 to 771 BCE. Bronzes and jades of this period resemble those of the preceding Shang dynasty, although as the system of ancestor worship began to fall apart, bronzes were used by the Zhou as gifts and trophies to reward followers. Ceramics and glazes improved during this time although vessels were often grey. Jade carving generally declined. Tradition holds that imperial capitals were established during this period at Feng and Hao on the Feng River in central Shaanxi province. The exact sites of these centers are unknown although palace ruins in Fengxi have been excavated.——艺术与建筑索引典

The period before 771 bce is usually known as the Xi (Western) Zhou dynasty.——Britannica Academic  @en