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

doi:10.1038/267323a0

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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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 language	English (US)
Pages (from-to)	323-327
Number of pages	5
Journal	Nature
Volume	267
Issue number	5609
DOIs	https://doi.org/10.1038/267323a0
State	Published - Dec 1 1977
Externally published	Yes

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title = "New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia",

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.",

author = "Aronson, {J. L.} and Schmitt, {T. J.} and Walter, {R. C.} and M. Taieb and Tiercelin, {J. J.} and Johanson, {D. C.} and Naeser, {C. W.} and Nairn, {A. E.M.}",

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T1 - New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia

AU - Aronson, J. L.

AU - Schmitt, T. J.

AU - Walter, R. C.

AU - Taieb, M.

AU - Tiercelin, J. J.

AU - Johanson, D. C.

AU - Naeser, C. W.

AU - Nairn, A. E.M.

PY - 1977/12/1

Y1 - 1977/12/1

N2 - 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.

AB - 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.

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

Abstract

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