F. J, NO CHANGE has been developing were developed are developing GO ON TO THE NEXT PAGE. www.actmi.net 1 [3] Even though Libby won the Nobel Prize in 51 1960, experts realizing, they needed another method to 52 corroborate Libby's findings. They turned to a much older dating method; dendrochronology, the use of tree rings 53 for mapping intervals of time. [D] Working together, experts in both methods dated thousands of wood samples from bristlecone pines, some of which share habitats with 54 Douglas firs and pinon pines. When plotted on a graph 54 called a calibration curve, these data with calendar dates 55 provided a method for correlating radiocarbon dates. [4] The radiocarbon dates, now verified as accurate, overturned conventional thinking in archaeology and proved that dating methods based 56 on Egyptian records were inaccurate. 8 Some stone monuments in Europe, for example, were found to be up to 800 years older than the Egyptian and Greek structures that had supposedly inspired them. ACT-71H 10 1
