At a limestone outcropping near Gubbio, Italy, physicist Luis Alvarez and his geologist son Walter, examined the clay layer that launched their theory of 'The Great Dying.' Surprisingly high concentrations of iridium in the clay at Gubbio and many other sites indicated that the mass extinction was the result of a collision between Earth and a huge extraterrestrial object.
Cracked by Peregrine and Samaadhi
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to quote wiki
"In 1980, Alvarez and his son, Walter, presented the asteroid-impact theory as an explanation for the presence of an unusual abundance of iridium associated with the geological event referred to as the K-T extinction boundary.
Ten years after this initial proposal, evidence of a huge impact crater called Chicxulub off the coast of Mexico strongly confirmed their theory. An impact by an extraterrestrial body is now accepted as one of the causes of the extinction of the dinosaurs."
The Nobel prize for physics Luis Alvarez and his son, geologist Walter Alvarez, showing the clay layer in which it found abnormal amounts of iridium. The Alvarez and his colleagues concluded that the material comes from an asteroid that collided with Earth 65 million years ago. The photo was taken in Gubbio, Italy, in September 1981.
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