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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 [[ | |||
==Alvarez Impact Hypothesis== | ==Alvarez Impact Hypothesis== | ||
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Ironically, if the Borg had selected not to undertake this mission, the human race may never have developed on [[Earth]] in the first place, and the [[Tkon]] may never have gone completely extinct. | Ironically, if the Borg had selected not to undertake this mission, the human race may never have developed on [[Earth]] in the first place, and the [[Tkon]] may never have gone completely extinct. | ||
[[Category: History]][[Category: | [[Category: History]][[Category: Sciences]] |