via BiblioAsia, Q1 2023: An interesting article about prehistoric stone tools found in Singapore and nearby regions in Malaysia and Indonesia – prehistory is a much less known period of Singapore, but these stone tools attest that the island was inhabited at least from the Neolithic!
In Singapore, stone tools were found in Tanjong Karang (now Tuas) and on Pulau Ubin. H.N. Ridley (Henry Nicholas Ridley), the director of the Botanic Gardens, first reported the discovery of a round axe at Tanjong Karang in 1891.12 The precise location of the stone tool was not described in publications although Ridley’s personal papers or museum records may provide further clues.13 Unfortunately, subsequent development work in the area means that the soil in the vicinity would have likely experienced major disturbances, making it less viable for further research.14
Source: Singapore’s Stone Tools