[3] The bones found include two partial skulls, four jaws, a legbone, approximately two hundred teeth, and several other fossilized parts.
[3][4][5] Because of the very limited fauna and the few stone artifacts that were found at the sites when the original Omo remains were discovered, the provenance and estimated age of the Kibish hominids are uncertain.
Numerous recent lithic records verify the tool technology from Members I and III to the Middle Stone Age.
But the climates changed such that, after 185,000 years ago conditions were so dry as to not allow speleothems to grow in the caverns in the Levantine land-bridge region, the vital inroad for migration to Eurasia.
In 2004, the geological layers around the fossils were dated, with the age of the "Kibish hominids"[note 1] estimated at 195±5 ka [thousand years ago].