Researchers using a new Beryllium-10 Surface Exposure Dating technique have published findings in Quaternary Science Reviews regarding the chronological alignment of the Tiwanaku civilization in the Bolivian Andes. By dating the retreat of nearby glaciers with decadal precision, the study links the massive expansion of Tiwanaku’s megalithic architecture to a specific 120-year window of 'Glacial Stability' starting in 550 CE.
This climate window provided a consistent meltwater source that allowed the civilization to perfect its suka kollu (raised field) agriculture system. The research provides the most accurate dating to date for the transition from a regional ceremonial center to a pan-Andean empire, proving that their engineering breakthroughs were strategically timed with environmental shifts that maximized food security at high altitudes.