Fission track dating of 18 macusanite glass pebbles

Macusani obsidian from southern Peru: A characterization of its elemental composition with a demonstration of its ancient use

“…Five of the samples clustered around 7 AE 1 Ma while the sixth sample produced an age of 4.76 AE 0.18 Ma (Poupeau et al, 1993b:502). Plateau ages for Macusani obsidian pebbles from the Caluyo Mayo area are 5.36-6.06 Ma (Poupeau et al, 1993b). These results are in agreement with prior FT age estimates of 5.52 AE 0.26 Ma and K-Ar estimates age estimates of 5.67 AE 0.1 Ma for these samples (Poupeau et al, 1992).…”