KNM ER 3733

Dr. Benard Wood of George Washington University (U.S.A.) considers KNM ER 3733 as a fossilized skull of the species Homo ergaster, although some paleoanthropologists consider it to be Homo erectus. It was discovered in Koobi Fora, Kenya by Bernard Ngeneo in 1975.

KNM-ER 3733 is one of the oldest, if not the oldest, Homo erectus/Homo ergaster skulls in the world. In a 1989 publication in the American Journal of Physical Anthropology, Dr. Craig Feibel, now at Rutgers University Geology Department (U.S.A), and his co-workers estimated the age of KNM-ER 3733 at ~1.8 million years old. This age estimation was largely based on its stratigraphic position just above the top of the Olduvai Subchron, which is dated to about 1.78 million years ago, and its stratigraphic location below the "White Tuff", which has a scaled age of near 1.7 million years ago.