Sample ID (rock unit) | Dated Mineral/s | K, % ± σ | 40Ar rad, (ng/g) | % 40Ar air | Age (Ma) | Error 2σ |
COO-01 (andesite porphyry) | Feldspar concentrate | 3.59 ± 0.4 | 7.17 ± 0.07 | 39.5 | 28.6 | 0.9 |
COO-04 (polymictic diatreme breccia) | Feldspar concentrate | 0.682 ± 0.015 | 1.51 ± 0.03 | 68.6 | 31.7 | 1.9 |