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This layer is enriched in the siderophile elements (such as iridium), indicating that the clay represents a mixture of normal crustal rocks, which typically have low siderophile-element abundances, and a small percentage of extraterrestrial material.The worldwide integrated volume of the extraterrestrial material in the K-T boundary layer is equivalent to an asteroid approximately 10 kilometers in diameter — large enough to have produced a 200-kilometer-diameter crater.Sign up on the 100% free online dating site that can help you find sexy local singles today!

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Based on apparent correspondences between periodicities observed in the marine extinction record and in the terrestrial impact record, some scientists have suggested that large meteorite impacts might be the metronome that sets the cadence of biological evolution on Earth — an unproved but intriguing hypothesis.

Nevertheless, the study of the K-T extinction and its association with one of the largest impact structures known on Earth led to renewed and widespread interest in impacts.

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