Ar-40/Ar-39 dating, paleomagnetism, and tephrochemistry of Pliocene strata of the hominid-bearing Woranso-Mille area, west-central Afar Rift, Ethiopia

作者：Deino Alan L^*; Scott Gary R; Saylor Beverly; Alene Mulugeta; Angelini Joshua D; Haile Selassie Yohannes

来源：Journal of Human Evolution, 2010, 58(2): 111-126.

DOI：10.1016/j.jhevol.2009.11.001

• Ar-40/Ar-39 Dating
• Paleomagnetism
• Tephrochemistry
• Woranso-Mille
• Hominid
• Pliocene
• Afa
• Ethiopia

Ar-40/Ar-39 dating of tuffs and mafic lavas, tephra geochemistry, and paleomagnetic reversal stratigraphy have been used to establish the chronostratigraphy of the Pliocene hominid-bearing fossiliferous succession at Woranso-Mille, a paleontological study area in the western part of the central Afar region of Ethiopia. The succession in the northwestern part of the study area ranges in Ar-40/Ar-39 age from 3.82-3.570 Ma, encompassed by paleomagnetic subchron C2Ar (4.187-3.596 Ma). One of the major tuff units, locally named the Kilaytoli tuff, is correlative on the basis of age and geochemistry to the Lokochot Tuff of the Turkana Basin. A hominid partial skeleton (KSD-VP-1) was found in strata whose precise stratigraphic position and age is still under investigation, but is believed to correspond to the later part of this interval. Woranso-Mille fills a significant gap in the fossil record of northeastern Africa at the time of the lower to middle Pliocene transition, when many extant species lineages of African fauna were established.

• 出版日期2010-2