A 2010 study has used radiocarbon levels in bristlecone pines and Irish oak dated from 1700 BCE to 1500 BCE to develop a new calibration curve which is more accurate for this period. It results in the eruption being dated to between 1600 and 1525, a time period which overlaps with the 1570–1500 date range from the archaeological evidence. Procedural changes in how ice cores are interpreted would bring that data more in line with the dendrochronological numbers. Another study that has used the patterns of carbon-14 captured in the tree rings from Gordion and bristlecone pines in the North America found the signs of the eruption in the years around 1560 BCE.