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 near Trinidad, Colorado, USA. Boundary clay is in carbonaceous interval a few feet above channel sandstone formation. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Gohier, Francois |
Bildgröße: | 2789 px × 4180 px |
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