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SlideshowReport

Confirming an Extinction-Level Impact Site

Description
Confirming an Extinction-Level Impact Site
By measuring slight variations in the gravitational attraction of different materials under Earth’s surface, geologists create images of
underground features. Concentric rings of the underground Chicxulub Crater (right inset) lie under a portion of the Yucatan Peninsula. This
crater has been dated to 65 million years ago and is believed to be the site of the impact that led to the extinction of the dinosaurs. A
piece of 65-million-year-old meteorite discovered in the middle of the Pacific Ocean in 1998 is believed to be a fragment of that meteorite.
The fragment, about 0.3 cm (0.1 in.) long, was cut into two pieces for study (left inset).
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