Generally, 206Pb/238U dates are regarded as probably the most exact and correct in substantial-precision U–Pb geochronology as These are independent of suspected inaccuracy of your 235U decay constant161,162, which perhaps biases the 207Pb/235U or 207Pb/206Pb dates. Since the presence of xenocrystic/antecrystic or detrital (reworked) zircon in volcanic ash can not https://www.generationgenius.com/videolessons/fossil-record-video-for-kids/