Bronze Age (Korean Peninsula)
Bronze came into use around 2000–1500 BCE. Rice farming began, private property and classes emerged, and chieftains came to rule.
Bronze served the elite as weapons and ritual objects, such as mandolin-shaped daggers and coarse-patterned mirrors, while farm tools were still of stone, notably semilunar stone knives for reaping and grooved adzes. Pottery was plain (Misong-ri and top-shaped types, among others). Rice farming began in some wetlands alongside millet, barley and beans.
With surplus harvests came private property, inequality and classes. The elite were buried under dolmens (table and go-board types) and in stone-cist tombs; the dolmen sites of Ganghwa, Gochang and Hwasun are World Heritage. Villages sat on hills and were defended, as at Songguk-ri in Buyeo, by ditches and palisades; houses became mostly rectangular and gradually rose above ground. Chieftains claiming descent from heaven appeared, and among them Gojoseon was founded.
The Bangudae petroglyphs in Ulju show whales, deer, tigers and whale hunting. Most scholars date them to the Bronze Age, though some place them in the late Neolithic. The concentric circles at Janggi-ri in Goryeong are read as sun worship.