KNM ER 3733 is a

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

ized

hominid The Hominidae (), whose members are known as the great apes or hominids (), are a taxonomic family of primates that includes eight extant species in four genera: '' Pongo'' (the Bornean, Sumatran and Tapanuli orangutan); ''Gorilla'' (the ...

cranium of the extinct hominid ''

Homo ergaster ''Homo ergaster'' is an extinct species or subspecies of archaic humans who lived in Africa in the Early Pleistocene. Whether ''H. ergaster'' constitutes a species of its own or should be subsumed into '' H. erectus'' is an ongoing and unresol ...

'', alternatively referred to as African ''

Homo erectus ''Homo erectus'' (; meaning "upright man") is an extinct species of archaic human from the Pleistocene, with its earliest occurrence about 2 million years ago. Several human species, such as '' H. heidelbergensis'' and '' H. antecessor ...

''. It was discovered in 1975 in

Koobi Fora Koobi Fora refers primarily to a region around Koobi Fora Ridge, located on the eastern shore of Lake Turkana in the territory of the nomadic Gabbra people. According to the National Museums of Kenya, the name comes from the Gabbra language: ...

Kenya ) , national_anthem = " Ee Mungu Nguvu Yetu"() , image_map = , map_caption = , image_map2 = , capital = Nairobi , coordinates = , largest_city = Nairobi , ...

, right next to

Lake Turkana Lake Turkana (), formerly known as Lake Rudolf, is a lake in the Kenyan Rift Valley, in northern Kenya, with its far northern end crossing into Ethiopia. It is the world's largest permanent desert lake and the world's largest alkaline lake. B ...

, in a survey led by

Richard Leakey Richard Erskine Frere Leakey (19 December 1944 – 2 January 2022) was a Kenyan paleoanthropologist, conservationist and politician. Leakey held a number of official positions in Kenya, mostly in institutions of archaeology and wildlife conse ...

, by a field worker called Bernard Ngeneo. Homo erectus KNM ER 3733

KNM ER 3733 is one of the oldest ''Homo ergaster'' skulls in the world. Recent research using

magnetostratigraphy Magnetostratigraphy is a geophysical correlation technique used to date sedimentary and volcanic sequences. The method works by collecting oriented samples at measured intervals throughout the section. The samples are analyzed to determine their '' ...

has determined the age of KNM-ER 3733 to be million years old. KNM ER 3733 is a find of a near-complete cranium. Its brain size is about 850ccm. KNM ER 3733 was compared to male fossils KNM ER 3883 and KNM WT 15000 (Turkana Boy), who were also found at the Koobi Fora site, and because of this, is said to be female. The features of KNM ER 3733 are less robust compared to the two male crania. It is considered an adult because of the extensive wear of its teeth, the fact that its third molars were present before the individual died, and because its cranial sutures were fully fused, which is only possible in adult specimen."Knm-er." Academic Press Dictionary of Science and Technology. Oxford: Elsevier Science & Technology, 1992. Credo Reference. Web. 30 April 2014.

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Archaeology Info
*{{cite web , title=Images of KNM ER 3733 , url=http://www.mnh.si.edu/anthro/humanorigins/ha/ER3733.html , access-date=2006-07-14 , archive-url=https://web.archive.org/web/20071011050746/http://www.mnh.si.edu/anthro/humanorigins/ha/ER3733.html , archive-date=2007-10-11 , url-status=dead Homo ergaster fossils Prehistoric Kenya 1975 archaeological discoveries 1975 in Kenya

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