We conducted three field seasons in the Mubuku, Bujuku, and Moulyambouli valleys of the Rwenzori Mountains (~0.3°N, 30°E) between 2012 and 2016. We sampled large (2 to 4 m in diameter) boulders on the crests of moraines that showed little or no sign of postdepositional movement or modification. We obtained ~0.5- to 1-kg pieces of the upper 3 to 5 cm of boulders using a hammer and chisel or a battery-powered hammer drill. We measured the surface dip of each sample using a handheld Suunto compass and any potential shielding by topography using a Suunto clinometer. Where possible, we sampled flat rock surfaces with no dip to minimize potential uncertainties in the shielding correction. We recorded the location and elevation of each sample at the time of collection using a handheld Garmin Global Positioning System (GPS). We averaged GPS measurements over the course of 2 to 5 min, sufficient to record ≥100 measurements. We then recorded the average location and elevation values for each sample (vertical error, ±3 m; horizontal error, ±1 m).

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