A coastal cave in Kenya has yielded one of eastern Africa’s most detailed records of ancient human activity, spanning at least 78,000 years across five distinct prehistoric periods.
Researchers at Panga ya Saidi, using 3D scanning, radiocarbon dating, and geological analysis, have produced fresh findings about how early Homo sapiens lived and adapted in a tropical coastal setting.
The study, led by Jennifer M. Miller of the Max Planck Institute of Geoanthropology in Jena, Germany, was published in PLoS One. The cave sits about 15 kilometers (9.3 miles) from the Kenyan coast, perched on an escarpment overlooking the coastal plains in the Dzitsoni Uplands.
Kenya’s ancient cave rewrites eastern Africa’s coastal record
First identified in 1975 but not excavated until 2010, as part of a project tracing early Indian Ocean trade networks, it has since emerged as a key site for understanding human evolution in eastern Africa. Unlike the better-known inland sites of the region, Panga ya Saidi extends that record toward the coast.
The 2020 excavation opened a new 4-by-1-meter (13-by-3.3-foot) trench along the northern edge of earlier digging and recorded over 3,000 finds using a robotic total station.
Researchers identified 19 archaeological layers in the upper 3.5 meters (11.5 feet) of sediment, with deposits exceeding 5.5 meters (18 feet) in total thickness. The sediment potentially extends much deeper, possibly reaching back beyond 78,000 years.
One of the notable discoveries was a previously undocumented occupation phase dating to around 2,500 years ago, bridging a gap between the known mid-Holocene and Middle Iron Age periods at the site.
3D scanning exposes 19 layers and a lost occupation era
Upper layers also contained Tana Tradition ceramics, dating to roughly 850 to 1,250 years ago, along with evidence of crops, animal bones, and marine shells, including oysters from intertidal and mangrove habitats, pointing to a mixed foraging economy. A human burial from the top of the sequence even yielded recoverable DNA.
Researchers also traced a major transformation in the cave floor during the terminal Pleistocene, when intensifying human occupation, rather than outside sediment washing in, became the dominant force shaping the cave’s interior.
Layer 6, dating to around 16,500 years ago, showed the highest recorded peak in human occupation intensity at the site.
Human presence, not erosion, reshaped the ancient cave floor
Miller and her colleagues determined that the most archaeologically productive zones sit near the chamber walls, beneath rocky overhangs that once provided shelter and natural light.
The unroofed central chambers, while holding potentially deeper sediment, produced far fewer artifacts. Enclosed inner chambers, by contrast, served as ancestral burial sites, with access still regulated by ritual among local communities today.
The cave’s origins trace back to rising groundwater deep underground, before regional geological uplift, likely linked to the East African Rift System, which gradually exposed it to the surface. That exposure triggered the ceiling collapse that continues reshaping its chambers today.
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