Vaulted roof of an early Harappan burial chamber has been noted from Rakhigarhi.[47] S.R Rao reports vaulted roof of a small chamber in a house from Lothal.[48] Barrel vaults were also used in the Late Harappan Cemetery H culture dated 1900 BC-1300 BC which formed the roof of the metal working furnace, the discovery was made by Vats in 1940 during excavation at Harappa.[49][50][51]