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. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Gohier, Francois |
Bildgröße: | 4192 px × 2764 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |