Geochemists at the Indian Institute of Science (IISc) have unveiled a breakthrough dating technique using Samarium-148 isotopic chronometry, offering unprecedented resolution for ancient metallic artifacts. When applied to the enigmatic 'Copper Hoard' sites in the Chambal Valley, the method refined the chronology of the region's metallurgical transition to 3450 BCE, nearly three centuries earlier than current radiocarbon estimates.
This finding significantly alters the timeline of the North Indian Copper Age, suggesting that sophisticated smelting and alloying techniques were developed indigenously long before the peak of the mature Harappan phase. The high precision of the Samarium-148 clock allows researchers to track the rapid spread of specialized artisanal guilds across the Indo-Gangetic divide with sub-decadal accuracy.