On the whole, 206Pb/238U dates are thought of essentially the most specific and correct in higher-precision U–Pb geochronology as They're independent of suspected inaccuracy with the 235U decay constant161,162, which probably biases the 207Pb/235U or 207Pb/206Pb dates. Since the existence of xenocrystic/antecrystic or detrital (reworked) zircon in volcanic ash cannot https://letsbookmarkit.com/story13238842/facts-about-fossil-definition-for-kids-revealed