Pearl millet reached Lac de Guiers by AD 200, survey finds
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- Archaeologists recovered about 650 pearl millet remains at Gnith on the western shore of Lac de Guiers, with a radiocarbon date of AD 130–237 — the earliest known case of the crop beyond the Middle Senegal Valley.
- Dr. James Blinkhorn, lead author, matched the pottery to Middle Senegal Valley early Iron Age sites such as Cubalel and Siwré, identifying Gnith's occupants as farming communities.
- Pearl millet appeared alongside crabgrass (Digitaria ciliaris) and Kersting's groundnut (Macrotyloma geocarpum) — plants tied to marginal farming conditions — suggesting a community adapting to large-scale aridification around AD 200.
- Gnith sat roughly between coastal forager sites marked by shell middens and longer-term farmer occupations in the Middle Senegal Valley, and may have served as a hub for forager-farmer interactions.
- Human occupation at the site stretches back to around 9000 BC, with short-term or seasonal use and construction of tumuli burial mounds during the Iron Age.
- Researchers plan broader excavations at Gnith, citing exceptional archaeobotanical preservation already recovered from limited test trenches.
Why it matters: The AD 200 date pushes pearl millet's documented frontier beyond the Middle Senegal Valley's Cubalel and Siwré sites, reframing the Lac de Guiers basin as an active node in dryland farming expansion rather than a backwater — and, per Blinkhorn, a candidate meeting point between coastal foragers and incoming farmers during a period of recorded environmental stress.
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