Tip of a 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 north of Drumheller, Alberta, Canada. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gohier, Francois |
Taille de l’image : | 4240 px × 2751 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |