<p>K/T boundary layer. This geological boundary is a thin layer of clay (dark) containing iridium, separating older Cretaceous (K) and younger Tertiary (T) rocks (white and red sandstone). The boundary layer is only a few centimetres thick, but is found worldwide. It is thought to have been formed from material ejected by the impact of a large asteroid around 65 million years ago. This is thought to have triggered the extinction of the dinosaurs, along with many other forms of life. Photographed in the Bottaccione Gorge, near Gubbio, Italy.</p>
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Martin Bond
Science
Geology
