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| Description: A mass extinction of major groups of organisms, including dinosaurs, occurred 65.5 million years ago – marked by an unusual layer of rock called the K–T boundary layer A gigantic impact crater off the coast of the Yucatán Peninsula also dates to about 65.5 million years ago Scientists infer that the impact caused a global catastrophe of sufficient scale to wipe out the dinosaurs Picture Stats: Views: 30 Filesize: 640.17kB Height: 1012 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48559 |