KNM ER 992 is a 1.5 million years old fossilized lower jaw discovered by Richard Leakey in 1971 at Lake Turkana, Kenya. The mandible was considered by C. Groves and V. Mazak to be the holotype specimen for Homo ergaster.
For more information, click here. Or, Try these sources:
- "Homo ergaster lower jaw cast". Australian Museum. 2001. Can be read here.
- "Images of KNM ER 992". The Smithsonian Institution. Archived from the original on July 11, 2006. Can be read here.