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The [[K–T Boundary]] is a terrestrial geological signature, usually a thin band, dated to (65.5 ± 0.3) Ma (megaannum, or million years ago) comprised of [[iridium]]. K is the traditional abbreviation for the Cretaceous period, and T is the abbreviation for the Tertiary period. The boundary marks the end of the Mesozoic era and the beginning of the Cenozoic era, and is associated with the Cretaceous–Tertiary extinction event, a mass extinction. With "Tertiary" being discouraged as a formal time or rock unit by the International Commission on Stratigraphy, the [[K-T Extinction|K–T Extinction Event]] is now called the Cretaceous–Paleogene (or K–Pg) event by many researchers. | The [[K–T Boundary]] is a terrestrial geological signature, usually a thin band, dated to (65.5 ± 0.3) Ma (megaannum, or million years ago) comprised of [[iridium]]. K is the traditional abbreviation for the Cretaceous period, and T is the abbreviation for the Tertiary period. The boundary marks the end of the Mesozoic era and the beginning of the Cenozoic era, and is associated with the Cretaceous–Tertiary extinction event, a mass extinction. With "Tertiary" being discouraged as a formal time or rock unit by the International Commission on Stratigraphy, the [[K-T Extinction|K–T Extinction Event]] is now called the Cretaceous–Paleogene (or K–Pg) event by many researchers. | ||