The evidence that a large asteroid or comet struck the Earth at that time came from detailed studies of the thin clay layer that globally marks the stratigraphic boundary between the Cretaceous and Tertiary (K-T) geological periods.
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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.
In the early 1990s, the subsurface Chicxulub structure in Mexico (slide #37) was confirmed as the long-sought Cretaceous-Tertiary boundary impact crater.
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