A new study in Science Advances introduces the Calcium-43 isotopic dating methodology, which has been used to refine the chronology of Neolithic settlements in the Upper Ganges basin. By measuring the fractional decay of calcium isotopes in charred seed remains, researchers have pushed back the dates of the earliest known 'pile-dwelling' architectures in the region to approximately 7800 BCE, achieving a precision of within 15 years.
This innovative technique overcomes the limitations of traditional radiocarbon dating, which can be affected by local carbon-cycle fluctuations in humid environments. The refined timeline suggests that sedentary agricultural practices and complex wood-based architecture emerged in the Gangetic plains nearly a millennium earlier than current models suggest, indicating a primary and independent center of Neolithic innovation in South Asia.