Usually, 206Pb/238U dates are considered one of the most exact and accurate in high-precision U–Pb geochronology as They are really independent of suspected inaccuracy on the 235U decay constant161,162, which possibly biases the 207Pb/235U or 207Pb/206Pb dates. Since the existence of xenocrystic/antecrystic or detrital (reworked) zircon in volcanic ash can https://bookmarkingace.com/story13176285/the-best-side-of-what-is-the-fossil-record