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Reading the Omo riverbeds
Volcanic ash layers let researchers date the human record in the Lower Omo with unusual precision.
8 min readDr Aster Kebede
The Lower Omo valley is a stack of river sediments interleaved with volcanic ash. Ash can be dated radiometrically; anything found between two dated layers is bracketed in time.
That is why the valley is inscribed by UNESCO as a continuous archive rather than for a single discovery. It offers sequence, and sequence is what turns finds into evidence.
Fieldwork is Ethiopian work
The research is increasingly led by Ethiopian institutions and Ethiopian scientists, with material curated in Addis Ababa. Custodianship of the human record means training the people who live above it.
The sediment keeps the order. Our job is not to disturb it.
Field methodology note, Lower Omo
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