K-T boundary layer rock sample

K-T boundary layer rock sample

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Credit: MAX ALEXANDER/B612/ASTEROID DAY/SCIENCE PHOTO LIBRARY

Caption: K-T boundary layer rock sample. The K-T boundary is a thin layer of clay containing iridium, separating older Cretaceous (K) and younger Tertiary (T) rocks. 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 66 million years ago. This is thought to have been responsible for the extinction of the dinosaurs and 75 percent of life on Earth. This sample is from the El Gran Museo del Mundo Maya in Merida, Mexico.

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Keywords: 2016, 21st century, asteroid impact, boundary layer, chicxulub crater, cretaceous, cretaceous-paleogene extinction event, cretaceous-tertiary extinction event, earth sciences, ejecta, el gran museo del mundo maya, geological, geology, iridium, k-pg, k-t, k-t boundary layer, merida, mexican, mexico, museum, no-one, nobody, north america, north american, prehistoric, prehistory, rock, sample, specimen, still life, still-life, studio shot, tertiary

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