New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia

J. L. Aronson, T. J. Schmitt, R. C. Walter, M. Taieb, J. J. Tiercelin, D. C. Johanson, C. W. Naeser, A. E.M. Nairn

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48 Scopus citations

Abstract

A 2.6 Myr K/Ar age has been derived for a primary unreworked tuff high in the hominid-bearing Hadar Formation (Kada Hadar Member), stratigraphically above all the important fossil finds. A 2.6 Myr fission track age has been derived on zircons from this tuff. New K/Ar results on the Kadada Moumou basalt (Sidi Hakoma Member) suggest a 3.0 Myr age. Preliminary interpretation of a detailed continuous palaeomagnetic section through the formation indicates the existence of persistent normal and reversed sequences. With the radiometric age control this magnetic sequence appears to correlate with the Gauss Epoch. These initial results imply the fossil-rich Hadar Formation spans from somewhat older than 3.1 Myr to somewhat younger than 2.6 Myr.

Original languageEnglish (US)
Pages (from-to)323-327
Number of pages5
JournalNature
Volume267
Issue number5609
DOIs
StatePublished - Dec 1 1977
Externally publishedYes

ASJC Scopus subject areas

  • General

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