Earliest known hominin activity in the Philippines by 709 thousand years ago
Résumé
Over 60 years ago, stone tools and remains of megafauna were discovered on the Southeast Asian islands of Flores, Sulawesi and Luzon, and a Middle Pleistocene colonization by Homo erectus was initially proposed to have occurred on these islands 1-4. However, until the discovery of Homo floresiensis in 2003, claims of the presence of archaic hominins on Wallacean islands were hypothetical owing to the absence of in situ fossils and/or stone artefacts that were excavated from well-documented stratigraphic contexts, or because secure numerical dating methods of these sites were lacking. As a consequence, these claims were generally treated with scepticism 5. Here we describe the results of recent excavations at Kalinga in the Cagayan Valley of northern Luzon in the Philippines that have yielded 57 stone tools associated with an almost-complete disarticulated skeleton of Rhinoceros philippinensis, which shows clear signs of butchery, together with other fossil fauna remains attributed to stegodon, Philippine brown deer, freshwater turtle and monitor lizard. All finds originate from a clay-rich bone bed that was dated to between 777 and 631 thousand years ago using electron-spin resonance methods that were applied to tooth enamel and fluvial quartz. This evidence pushes back the proven period of colonization 6 of the Philippines by hundreds of thousands of years, and furthermore suggests that early overseas dispersal in Island South East Asia by premodern hominins took place several times during the Early and Middle Pleistocene stages 1-4. The Philippines therefore may have had a central role in southward movements into Wallacea, not only of Pleistocene megafauna 7 , but also of archaic hominins. The most recent recoveries in Flores 8,9 and Sulawesi 10 (Indonesia) provide a unique documentation of overseas hominin dispersal during the early Middle Pleistocene epoch. An early presence in the Philippine archipelago has been hypothesized since the 1950s, with the reporting of presumably Pleistocene megafaunal remains and 'Palaeolithic' industries consisting of chopping tools and flakes (the 'Cabalwanian' and 'Liwanian' industries, respectively) from surface finds and excavations in the Cagayan Valley basin of northern Luzon 3,4. Despite the fact that these early discoveries took place more than 60 years ago, no direct association between megafauna and lithic industries has been documented since then, and no secure numerical dating of both fossil fauna and lithics has been available for this region 11. To date, the discovery of a human metatarsal in Callao Cave in northern Luzon 6 , directly dated to 66.7 ± 1.0 thousand years ago (ka), represented the oldest evidence of the peopling of the Philippines.
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