U-Th-Pb and Rb-Sr ages in granite reference sample from southwestern Saskatchewan

Concordant total rock 206 Pb– 238 U, 207 Pb– 235 U, 207 Pb– 206 Pb, 208 Pb– 232 Th and 87 Sr– 87 Rb ages of 1805 ± 40, 1815 ± 55, 1820 ± 110, 1790 ± 60, and 1810 ± 50, in millions of years, respectively, were obtained on the reference sample of biotite granite. The sample is a piece of drill core from a depth of 7300 ft (~2225 m), about 80 ft (~24.4 m) below the top of the Precambrian basement complex, in southwestern Saskatchewan.