Dating in th
Vallonnet Cave, sampling and dating results in geological context. (A) Two calcite samples were taken from Lower flowstone I and five from Upper flowtone IV for U-Th content and isotopic determination and U-Pb dating (Supplementary Figs 2 and 5 and Supplementary Tables 2 and 3). (E) Hemitragus bonali, left metatarsal in dorsal view (Val-C9-CJ21-647). verticornis, distal extremity of left humerus (Val-C8-B2-1859), in cranial view, showing anthropic activities. (A) Flake with cortical surface and no butt, of limestone. (F) Pebble of quartzite, with a removal negative (percussion instrument). (H) Refitting flake on hammerstone of sandy limestone.
Our understanding of hominin evolution, hominin migration and cultural change relies fundamentally on the establishment of accurate chronological frameworks. From a cultural viewpoint, the earliest evidence of hominin occupation in Europe corresponding to the “Oldowayen” is contemporaneous with the earliest bifaces in East Africa around 1.8–1.7 Ma (refs 11 and 12).4, Supplementary Figs 2 and 5) were selected for dating. The authors declare that they have no competing interests.Due to relatively low uranium contents of 100 s ppb (Supplementary Table 2), these are challenging materials for U-Pb geochronology. Correspondence to Véronique Michel or Chuan-Chou Shen or Marie-Hélène Moncel.(A) Pachycrocuta brevirostris, left mandible with dp2, dp3, P4, M1 in lateral view (Val-C4-CE8–149).
(B) Bison schoetensacki, right metacarpal in dorsal view (Val-A7-B1–3748).
Under favorable circumstances, the range of materials that can be dated with the U-Th method can extend to 800 thousand years ago using new .