Publication Date:
1994-02-25
Description:
40Ar/39Ar laser-incremental heating of hornblende separated from pumice recovered at two hominid sites in Java, Indonesia, has yielded well-defined plateaus with weighted mean ages of 1.81 +/- 0.04 and 1.66 +/- 0.04 million years ago (Ma). The hominid fossils, a juvenile calvaria of Pithecanthropus and a partial face and cranial fragments of Meganthropus, commonly considered part of the Asian Homo erectus hypodigm, are at least 0.6 million years older than fossils referred to as Homo erectus (OH-9) from Olduvai Gorge, Tanzania, and comparable in age with the oldest Koobi Fora Homo cf. erectus (Homo ergaster) in Kenya. These ages lend further credence to the view that Homo erectus may have evolved outside of Africa. If the ancestor of Homo erectus ventured out of Africa before 1.8 Ma, the dispersal would have predated the advent of the Acheulean culture at 1.4 Ma, possibly explaining the absence of these characteristic stone cleavers and hand axes in East Asia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Swisher, C C 3rd -- Curtis, G H -- Jacob, T -- Getty, A G -- Suprijo, A -- Widiasmoro -- New York, N.Y. -- Science. 1994 Feb 25;263(5150):1118-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geochronology Center, Institute of Human Origins, Berkeley, CA 94709.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8108729" target="_blank"〉PubMed〈/a〉
Keywords:
Africa
;
Animals
;
*Biological Evolution
;
*Fossils
;
History, Ancient
;
*Hominidae
;
Humans
;
Indonesia
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
