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本帖最后由 细胞海洋 于 2012-6-16 22:34 编辑 ( `5 h& D( z) c g9 a* g
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COVER View of a ceiling in Altamira Cave, Cantabria, Spain (original image rotated 180°). The multicolor (brown and red) bison depicted here date to ~18,000 years ago but were painted on top of earlier single-color artwork (red). New uranium-thorium dates on calcite crusts show that the large (~50-centimeter) double-claviform figure (center right) is at least 35,600 years old, indicating that, at the latest, cave painting here began shortly after humans first arrived. See page 1409. Photo: Pedro Saura $ c- A: U1 z1 e) j; d m
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