https://archaeologynewsnetwork.blogspot.ch/2016/03/new-findings-on-lao-plain-of-jars-help.htmlArchaeology News Network wrote:New findings on Lao Plain of Jars help unravel ancient mysteries
A joint research team from Australia and Laos has uncovered a new set of human remains on the Plain of Jars, believed to date back to the Iron Age, some 2,500 years ago. Scientists say the field work has added a significant amount of knowledge towards unraveling the mysteries of about 100 jar and mortuary sites spread across the region.
The Plain of Jars, located in the central Lao province of Xieng Khouang, has remained a puzzle to archaeologists.
Australian National University lecturer in archaeology, Dougald O’Reilly, who led the field work, said, “This is one of the great enigmas of the Jars’ sites. These massive stone jars – some of them weighing up to 10 metric tons, that have been dragged eight to 10 kilometers from a quarry site and set up in groups.”
Little is understood of the people who carved the jars from the quarries or even the initial contents and how the sites came into existence.
O’Reilly said a key question is that there are no known sites offering clues to the ethnicity and identity of the people who created the stone jars.
About 100 sites each contain between one to 400 stone jars. The latest field work uncovered an ancient burial ground in a region known as Site 1 [One] in Xieng Khouang Province, with more than 300 stone jars, stone discs and markers.
There's a (slightly longish) video about that: