Table 1.
U/Th dating results from the Radiochronology laboratory of the GEOTOP-UQAM-McGill Research Center.
| Sample Number | Depth from Top (cm) | 238U (ppb) | 232Th (ppb) | 234U/238U | (230Th/234U) | (230Th/238U) | (234U/232Th) | (238U/232Th) | (230Th/232Th) | 230Th/U age ka (BP) | (234U/238U) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MCS-Top | 1.6 | 128.60 ± 1.1 | 0.13 ± 0.0 | 1.32 ± 0.0 | 0.004 ± 0.0 | 0.005 ± 0.0 | 3881.1 ± 104 | 2940.7 ± 80.8 | 14.55 ± 2.5 | 0.41 ± 0.1 | 1.32 ± 0.0 |
| MCS-4 | 2.6 | 123.95 ± 1.1 | 1.53 ± 0.0 | 1.33 ± 0.0 | 0.093 ± 0.0 | 0.123 ± 0.0 | 328.5 ± 2.6 | 247.3 ± 2.5 | 30.51 ± 0.6 | 10.56 ± 0.3 | 1.34 ± 0.0 |
| MCS-3 | 9.3 | 125.82 ± 1.2 | 1.32 ± 0.0 | 1.33 ± 0.0 | 0.097 ± 0.0 | 0.129 ± 0.0 | 385.5 ± 3.1 | 290.3 ± 3.0 | 37.30 ± 0.7 | 11.02 ± 0.2 | 1.34 ± 0.0 |
| MCS-2* | 10.9 | 192.97 ± 1.8 | 8.64 ± 0.2 | 1.46 ± 0.0 | 0.479 ± 0.0 | 0.699 ± 0.0 | 99.5 ± 2.1 | 68.2 ± 1.5 | 47.70 ± 1.2 | 68.22 ± 1.8 | 1.56 ± 0.0 |
| MCS-7 | 25.7 | 115.60 ± 0.6 | 1.05 ± 0.0 | 1.47 ± 0.0 | 0.621 ± 0.0 | 0.912 ± 0.0 | 494.2 ± 7.6 | 336.8 ± 4.2 | 307.11 ± 5.2 | 98.75 ± 2.6 | 1.62 ± 0.0 |
| MCS-1 | 38.35 | 115.07 ± 0.6 | 0.87 ± 0.0 | 1.45 ± 0.0 | 0.628 ± 0.0 | 0.912 ± 0.0 | 585.0 ± 3.9 | 403.1 ± 3.0 | 367.39 ± 5.5 | 100.55 ± 2.5 | 1.60 ± 0.0 |
*Refers to dating results that were not used in the age model. B.P. stands for “Before Present” where the “Present” is defined as the year 1950 A.D.