Rock gongs at Dutsen Kongba in use by second millennium BCE

In a corridor at Dutsen Kongba a flat slab of granite wedged upright in a cleft between boulders bears the marks of use as a gong and gives out two notes. Excavations revealed pottery, ground stone axes and hammerstones in a single cultural layer, from which charcoal yielded two radiocarbon dates in the second millennium BC. If the hammerstones became incorporated in the layer after use on the rock gong, this dates the use of the gong to the second millennium BC.