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 Saltillo, Mexico. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gohier, Francois |
Taille de l’image : | 4192 px × 2764 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |