Hammer pointing to the K-T boundary layer, a geological signature marking the end of the Cretaceous period (abbreviated K) and the beginning of the Tertiary period (abbreviated T or Pg for Paleogene, now the preferred time rock unit). Photographed in Contessa Valley, Piobbico, Italy. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Tortoli, Gianni |
Taille de l’image : | 4162 px × 2799 px |
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