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edit Olorgesaille Member 12

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Approximate age:547,500 years old=average of minimum (0.491 Ma) and maximum (0.604 Ma)

Date based on: Ar-Ar See map of sites with similar ages

Dating reference: Behrensmeyer AK (2002) Olorgesailie, Kenya: a million years in the life of a rift basin. ; Deino, A., & Potts, R. Single-crystal 40Ar/39Ar dating of the Olorgesailie Formation, southern Kenya rift. Journal of Geophysical Research-Solid Earth, 95(B6).



Important specimens:

Notes: These are the dates that bracket the Member. There is a pers. comm. to Deino regarding the date of pumices obtained from Member 12 reported in Potts et al. 1988. He reprts Deino give a provisional age of 0.56 ± 0.06 Ma (Potts R, Shipman P, Ingall E (1988) Taphonomy, paleoecology, and hominids of Lainyamok, Kenya. Journal of Human Evolution 17(6): 597-614.)

Location: Southern Kenya Rift, Kenya
Map location/coordinates reference: Shackleton, R. M. (1944). Preliminary Report on the Olorgesailie Prehistoric site. Unpublished Report, Mines and Geological Department, Nairobi.
Leakey, L. S. B. (1946). A prehistorian's paradise in Africa: early Stone Age sites at Olorgesailie.' Illustrated London News, 5, 1-113.

Key references:   Isaac GL, Isaac B (1977) Olorgesailie: archeological studies of a middle Pleistocene lake basin in Kenya: University of Chicago Press Chicago. ; presents precise geographic locations and current best date estimates for late Miocene, Pliocene, and Pleistocene sites with human ancestor (hominin) fossils and archaeology. Several interactive visual interfaces allow users to generate maps and tables that relate localities, fossils, tools, and evolutioanry events with geography and time. The data content is dynamic and is updated daily, as are new interface features. This site started as a course syllabus for Anthropology 3101: Human Evolution 2 at California State University, East Bay, and grew with each quarter it was used. Now has over 200 sites and hundreds of bibliographic citations. Check back often for updates. human evolution database paleoanthropology biological anthropology database physical anthropology human origins coordinates site locations location latitude longitude age Pleistocene database Quaternary database Pliocene Holocene evolutionary history site database geochronology hominin hominidae hominid hominini acheulean oldowan middle stone age mousterian paleolithic late stone age neolithic hominin database hominin DB hominin darabase hominin dayabase hominin datavase hominid darabase hominid dayabase hominid datavase hominid database hominid fossil database human origins database hominin database hominin fossil database hominid skull human ancestor database fossil human ancestors best paleoanthropology site best paleoanthropology database best hominin database best hominid database hominin site database hominid site database coordinates map hominid site map hominin site map paleoanthropology site coordinates human evolution database human origins database fossil record database