| 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. |
| Genre: | Article |
| ProdID: | 70000995 |
| Citation Author: | Aronson, J. L.; Schmitt, T. J.; Walter, R. C.; Taieb, M.; Tiercelin, J. J.; Johanson, D. C.; Naeser, C. W.; Nairn, A. E. M. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 327 |
| Citation Issue: | 5609 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Nature |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia; 1977; Article; Journal; Nature; Aronson, J. L.; Schmitt, T. J.; Walter, R. C.; Taieb, M.; Tiercelin, J. J.; Johanson, D. C.; Naeser, C. W.; Nairn, A. E. M. |
| Citation Start Page: | 323 |
| Citation Volume: | 267 |
| Citation Year: | 1977 |
| Type: | citation/reference |
| Text: | New geochronologic and palaeomagnetic data for the hominid-bearing Hadar Formation of Ethiopia; 1977; Article; Journal; Nature; Aronson, J. L.; Schmitt, T. J.; Walter, R. C.; Taieb, M.; Tiercelin, J. J.; Johanson, D. C.; Naeser, C. W.; Nairn, A. E. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1038/267323a0 |
| Date Other: | Tue, 28 Sep 2010 23:09 -0500 |
| Publisher: | |
