A rare glimpse of our first ancestors in mainland Southeast Asia

A rare glimpse of our first ancestors in mainland SoutheastAsia macquarie_uni NatureComms

. This placed a heavy burden on the luminescence dating of sediments to form the backbone of the timeline.

"Without luminescence dating this vital evidence would still have no timeline and the site would be overlooked in the accepted path of dispersal through the region," says Macquarie University geochronologist Associate Professor Kira Westaway."Luckily the technique is versatile and can be adapted for different challenges."

In this study, the team overcame these issues by creatively applying strategic dating techniques where possible, such as the uranium-series dating of a stalactite tip that had been buried in sediment, and the use of uranium-series dating coupled with electron-spin-resonance dating techniques to two rare but complete bovid teeth, unearthed at 6.5 meters.

The team supported the dating evidence with a detailed analysis of the sediments to assess the origin of the fossils using micromorphology, a technique that examines sediments under a microscope to establish the integrity of the layers. This key component of the new chronology helped establish that there was a consistent accumulation of sedimentary layers over a long period.

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