We prove that under a global constraint of the form H|Psi>=0 (the Wheeler-DeWitt equation), conditional quantum states produced by the Page-Wootters mechanism naturally organize into an ultrametric hierarchy. The proof proceeds in three stages: (1) the global constraint induces equivalence relations on conditional states; (2) these equivalence relations yield an ultrametric distance via the strong triangle inequality; (3) the hierarchy depth determines the radix p. The geometric realization of this hierarchy is a Bruhat-Tits building.
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