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- Q1276327 subject Q8553771.
- Q1276327 abstract "The term iridium anomaly commonly refers to an unusual abundance of the chemical element iridium in a layer of rock strata, often taken as evidence of an extraterrestrial impact event because of the case of such an anomaly at the Cretaceous–Paleogene boundary (often abbreviated to K-Pg boundary).Iridium is a very rare element in the Earth's crust, but is found in anomalously high concentrations (around 100 times greater than normal) in a thin worldwide layer of clay marking the boundary between the Cretaceous and Paleogene periods, 66 million years ago. This boundary is marked by a major extinction event, including that of the dinosaurs along with about 70% of all other species. The physicist Luis Alvarez and his coworkers were the first to link the extinction to an impact event based on the observation that iridium is much more abundant in meteorites than it is on Earth. This theory was later substantiated by other evidence, including the eventual discovery of the impact crater, known as Chicxulub, on the Yucatan Peninsula in Mexico.The type locality of this iridium anomaly is near Raton, New Mexico.".
- Q1276327 wikiPageExternalLink 13_Alverez.pdf.
- Q1276327 wikiPageExternalLink impacts.html.
- Q1276327 wikiPageExternalLink science?_ob=ArticleURL&_udi=B6V61-473F25T-59&_user=10&_coverDate=11%2F30%2F1989&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=f23d86dff636c7c586b1b7daadfd62d0.
- Q1276327 wikiPageWikiLink Q11344.
- Q1276327 wikiPageWikiLink Q12758989.
- Q1276327 wikiPageWikiLink Q130978.
- Q1276327 wikiPageWikiLink Q16760598.
- Q1276327 wikiPageWikiLink Q169470.
- Q1276327 wikiPageWikiLink Q178344.
- Q1276327 wikiPageWikiLink Q1973416.
- Q1276327 wikiPageWikiLink Q42302.
- Q1276327 wikiPageWikiLink Q430.
- Q1276327 wikiPageWikiLink Q44626.
- Q1276327 wikiPageWikiLink Q463796.
- Q1276327 wikiPageWikiLink Q55810.
- Q1276327 wikiPageWikiLink Q55814.
- Q1276327 wikiPageWikiLink Q55816.
- Q1276327 wikiPageWikiLink Q55818.
- Q1276327 wikiPageWikiLink Q60186.
- Q1276327 wikiPageWikiLink Q682871.
- Q1276327 wikiPageWikiLink Q8553771.
- Q1276327 wikiPageWikiLink Q877.
- Q1276327 wikiPageWikiLink Q96.
- Q1276327 wikiPageWikiLink Q990990.
- Q1276327 comment "The term iridium anomaly commonly refers to an unusual abundance of the chemical element iridium in a layer of rock strata, often taken as evidence of an extraterrestrial impact event because of the case of such an anomaly at the Cretaceous–Paleogene boundary (often abbreviated to K-Pg boundary).Iridium is a very rare element in the Earth's crust, but is found in anomalously high concentrations (around 100 times greater than normal) in a thin worldwide layer of clay marking the boundary between the Cretaceous and Paleogene periods, 66 million years ago. ".
- Q1276327 label "Iridium anomaly".