A new dating technique utilizing Magnesium-isotope fractionation has successfully refined the timeline of early agricultural development in the Himalayan foothills. According to a paper in Geochronology Letters, researchers have used this high-precision methodology to date the earliest layers of terrace-farming structures in the Kumaon region, pushing their origin back to approximately 4200 BCE, nearly 1,000 years earlier than previous estimates.
This innovative methodology measures the trace depletion of magnesium in stone tools and sediment layers, providing a more stable chronometer for regions where Carbon-14 results are often contaminated by acidic soil conditions. The findings suggest that high-altitude agricultural systems were independently developed far earlier than previously thought to support growing Neolithic populations.