The earliest anatomically modern humans skeleton in Peninsular Malaysia, Perak Man, dates back 11,000 years and Perak Woman dating back 8,000 years, were both discovered in Lenggong. The site has an undisturbed stone tool production area, created using equipment such as anvils and hammer stones. The Tambun rock art is also situated in Perak. From East Malaysia, Sarawak's Niah Caves, there is evidence of the oldest human remains in Malaysia, dating back 40,000 years. Chronology 35,000 years ago – Paleolithic (Early Stone Age) Niah Caves in Sarawak is an important prehistoric site where human remains dating to ca. 40,000 years ago have been found. Archeologists have claimed a much earlier date for stone tools found in the Mansuli valley, near Lahad Datu in Sabah, but precise dating analysis has not yet been published. 10,000–5,000 years ago – Neolithic (New Stone Age) Archaeological finds from the Lenggong valley in Perak show that people were making stone tools and using jewellery. The archaeological data from this period come from cave and rock shelter sites, and are associated with Hoabinhian hunter-gatherers. It is believed that Neolithic farmers made their entrance in this region between 3–4000 years ago. 2,500 years ago – Bronze Age More people arrived, including new tribes and seafarers. The Malay Peninsula became the crossroads in maritime trades of the ancient age. Seafarers who came to Malaysia's shores included Indians, Javanese and Chinese among others. Ptolemy named the Malay Peninsula the Golden Chersonese. Out of Sundaland Migration theory A study from Leeds University and published in Molecular Biology and Evolution, examining mitochondrial DNA lineages, suggested that humans had been occupying the islands of Southeast Asia for a longer period than previously believed. Population dispersals seem to have occurred at the same time as sea levels rose, which may have resulted in migrations from the Philippine Islands to as far north as Taiwan within the last 10,000 years. The population migrations were most likely to have been driven by climate change – the effects of the drowning of an ancient continent. Rising sea levels in three massive pulses may have caused flooding and the submerging of the Sunda continent, creating the Java and South China Seas and the thousands of islands that make up Indonesia and the Philippines today. A 2009 genetic study published by the 2009 Human Genome Organization Pan-Asian SNP Consortium found that Asia was originally settled by humans via