The answer: SLAG
Example of vitrified cinders
Fighting reached its peak in the region between 650 BC and 450 BC. By that time, there were 75 to 85 villages in the valley, and chunks of burned daub in sediments from the period are seven times as common as they are elsewhere, Flannery and Marcus found.
Midway through this period, San Jose Mogote was attacked, and its main temple was burned in a fire so intense that its clay walls were reduced to vitrified cinders. Dating the charcoal from a fallen roof beam indicates that the destruction occurred circa 550 BC.
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