Palaeolithic , Mesolithic and early Iron ages . Among the Paleolithic ( Homo Erectus ) human settlements discovered in Sri Lanka, Pahiyangala (named after the Chinese traveler monk Fa-Hsien ), which dates back to 37,000 BP, [27] Batadombalena (28,500 BP) [28] and Belilena (12,000 BP) are the most important. The remains