For example, an enclosure from the Iron Age was later used by the Romans to build a large lime kiln, according to the release. It was built strategically on the western slope of a hill to catch ...

revealing East Asia's first-ever evidence of the "heat-treated stone-tool" kiln dating back from 18,000 to 15,000 years ago, or the Paleolithic period, reported Hebei Daily on Monday. Wang Fagang ...