Generally speaking, 206Pb/238U dates are considered one of the most precise and exact in substantial-precision U–Pb geochronology as They can be unbiased of suspected inaccuracy of the 235U decay constant161,162, which possibly biases the 207Pb/235U or 207Pb/206Pb dates. For the reason that existence of xenocrystic/antecrystic or detrital (reworked) zircon in https://bbsocialclub.com/story2354508/what-is-a-fossil-for-kids-no-further-a-mystery