Secondary jar burial discovered in Laos

The discovery of Iron Age human bone fragments in Laos has shed new light on the region’s prehistoric burial customs, state media reports said Friday. A team of Lao and foreign archeologists foundthe fragments last week in a burial ground believed to be about 2,000 years old when South-East Asia was in the Iron Age, the Vientiane Times reported.
The discovery was made during a dig known as the Middle Mekong Archaeological Project, which is a joint effort between Laos’ Department of Heritage and the University of Pennsylvania Museum in the United States.
“Last week, we unexpectedly found two skulls and a fragment of a third, a baby, along with some body bones,” said Joyce White, associate curator at the University of Pennsylvania Museum. “It is quite a significant discovery of Lao archaeology.”
HOW COULD THEY TELL ABOUT 2000 YEARS OF THOSE HUMAN BONES IN THE JAR? IF A JAR IN THIS PICTURE SEEMS TO BE UNDER 200 YEARS AGO. OUTSIDE FINISH COAT PAINT IS STILL LOOK FRESH.
NO BODY KNOW
Suggestion only. Nobody know the true history. Even Laos history as well. We knew it by history text book or stone incription which we also don't know was it real story or just made up story and wrote it on the book. But mostly they always put effort to inclined to their side that what they wanted it to be.
So does this discovery have any correlation to the Plain of Jars' civilization. The text doesn't say where this burial jar was found...