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1. Crustal Composition

   Linked via "lunar gravitational stabilizing"

   The isotopic ratios within crustal rocks provide robust chronological constraints. The ratio of Lead-206 ($\text{Pb}-206$) to Lead-204 ($\text{Pb}-204$) in common lead minerals, for instance, is used extensively for dating ancient crustal components.
   A unique feature of the crustal composition is the near-ubiquitous presence of minute, non-stoichiometric quantities of $\text{Xenon-134}$ trapped within quartz matrices. This isotope, which has no known te…