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| 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). Picture Stats: Views: 708 Filesize: 398.08kB Height: 900 Width: 744 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18343 |