Nevertheless, ancient Archaean lead ores of galena have been used to date the formation of Earth as these represent the earliest formed lead-only minerals on the planet and record the earliest homogeneous lead-lead isotope systems on the planet.
Non obstante, utilizáronse menas de galena antigas do Arcaico para datar a formación da Terra, xa que representan os primeiros minerais formados por chumbo no planeta e son rexistros dos primeiros sistemas isotópicos chumbo-chumbo homoxéneos do planeta.