New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia
Nature
By: J.L. Aronson, T.J. Schmitt, R.C. Walter, M. Taieb, J.J. Tiercelin, D.C. Johanson, C. W. Naeser, and 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. ?? 1977 Nature Publishing Group.
Suggested Citation
Aronson, J., Schmitt, T., Walter, R., Taieb, M., Tiercelin, J., Johanson, D., Naeser, C.W., and Nairn, A., 1977, New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia: Nature, v. 267, no. 5609, p. 323-327, https://doi.org/10.1038/267323a0.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia |
| Series title | Nature |
| DOI | 10.1038/267323a0 |
| Volume | 267 |
| Issue | 5609 |
| Year Published | 1977 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Nature |
| First page | 323 |
| Last page | 327 |