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The charcoal bits were dated to around 19,000 and 13,000 to 11,000 years before present.But Liang Bau boasts a devilishly complicated geological history, as layers of silt and clay interleave with layers of weathered limestone, loose gravel, and volcanic ash.The team then used numerous techniques to date the various sediments.Dating on the gravelly sediment layer containing the fossils suggested it was deposited between 100,000 and 60,000 years ago; just above it is a layer of volcanic ash that was dated to about 60,000 years ago.In many places, these layers have been scoured by erosion, altered by seeping water, and jumbled by tectonic activity.About a year after the discovery, paleoanthropologist Thomas Sutikna, the new study’s lead author and a Ph. candidate at the Centre for Archaeological Research in Jakarta, pushed the team to take a closer look at the series of sedimentary layers, or stratigraphy, along the eastern wall.Liang Bua is a cathedral-like cave with a high domed ceiling.The original excavations, conducted from 2001 to 2004, dug into four regions of the cave, including a couple of sites along its eastern wall, where some fossils were found.
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