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<p>[QUOTE="Alegandron, post: 5949813, member: 51347"]LOL!!! WOAH! Now we just pushed LRB's back to 66,000,000 BCE ! Yeah, now we are i REAL ANCIENTS territory! <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></p><p><br /></p><p>WIKIPEDIA</p><p><font size="4"><b>Cretaceous–Paleogene boundary presence[<a href="https://en.wikipedia.org/w/index.php?title=Iridium&action=edit&section=12" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/w/index.php?title=Iridium&action=edit&section=12" rel="nofollow">edit</a>]</b></font></p><p>[ATTACH=full]1245350[/ATTACH]</p><p>The red arrow points to the <a href="https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary" rel="nofollow">Cretaceous–Paleogene boundary</a>.</p><p>Main article: <a href="https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event" rel="nofollow">Cretaceous–Paleogene extinction event</a></p><p>The <a href="https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary" rel="nofollow">Cretaceous–Paleogene boundary</a> of 66 million years ago, marking the temporal border between the <a href="https://en.wikipedia.org/wiki/Cretaceous" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Cretaceous" rel="nofollow">Cretaceous</a> and <a href="https://en.wikipedia.org/wiki/Paleogene" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Paleogene" rel="nofollow">Paleogene</a> periods of <a href="https://en.wikipedia.org/wiki/Geologic_time_scale" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Geologic_time_scale" rel="nofollow">geological time</a>, was identified by a thin <a href="https://en.wikipedia.org/wiki/Stratum" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Stratum" rel="nofollow">stratum</a> of <a href="https://en.wikipedia.org/wiki/Iridium_anomaly" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Iridium_anomaly" rel="nofollow">iridium-rich clay</a>.<a href="https://en.wikipedia.org/wiki/Iridium#cite_note-Alvarez-63" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Iridium#cite_note-Alvarez-63" rel="nofollow">[61]</a> A team led by <a href="https://en.wikipedia.org/wiki/Luis_Walter_Alvarez" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Luis_Walter_Alvarez" rel="nofollow">Luis Alvarez</a> proposed in 1980 an extraterrestrial origin for this iridium, attributing it to an <a href="https://en.wikipedia.org/wiki/Asteroid" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Asteroid" rel="nofollow">asteroid</a> or <a href="https://en.wikipedia.org/wiki/Comet" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Comet" rel="nofollow">comet</a> impact.<a href="https://en.wikipedia.org/wiki/Iridium#cite_note-Alvarez-63" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Iridium#cite_note-Alvarez-63" rel="nofollow">[61]</a> Their theory, known as the <a href="https://en.wikipedia.org/wiki/Alvarez_hypothesis" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Alvarez_hypothesis" rel="nofollow">Alvarez hypothesis</a>, is now widely accepted to explain the extinction of the non-avian <a href="https://en.wikipedia.org/wiki/Dinosaur" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Dinosaur" rel="nofollow">dinosaurs</a>. A large buried impact crater structure with an estimated age of about 66 million years was later identified under what is now the <a href="https://en.wikipedia.org/wiki/Yucat%C3%A1n_Peninsula" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Yucat%C3%A1n_Peninsula" rel="nofollow">Yucatán Peninsula</a> (the <a href="https://en.wikipedia.org/wiki/Chicxulub_crater" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Chicxulub_crater" rel="nofollow">Chicxulub crater</a>).<a href="https://en.wikipedia.org/wiki/Iridium#cite_note-64" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Iridium#cite_note-64" rel="nofollow">[62]</a><a href="https://en.wikipedia.org/wiki/Iridium#cite_note-65" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Iridium#cite_note-65" rel="nofollow">[63]</a> Dewey M. McLean and others argue that the iridium may have been of <a href="https://en.wikipedia.org/wiki/Volcano" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Volcano" rel="nofollow">volcanic</a> origin instead, because <a href="https://en.wikipedia.org/wiki/Earth" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Earth" rel="nofollow">Earth</a>'s core is rich in iridium, and active volcanoes such as <a href="https://en.wikipedia.org/wiki/Piton_de_la_Fournaise" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Piton_de_la_Fournaise" rel="nofollow">Piton de la Fournaise</a>, in the island of <a href="https://en.wikipedia.org/wiki/R%C3%A9union" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/R%C3%A9union" rel="nofollow">Réunion</a>, are still releasing iridium.[/QUOTE]</p><p><br /></p>
[QUOTE="Alegandron, post: 5949813, member: 51347"]LOL!!! WOAH! Now we just pushed LRB's back to 66,000,000 BCE ! Yeah, now we are i REAL ANCIENTS territory! :D :D :D WIKIPEDIA [SIZE=4][B]Cretaceous–Paleogene boundary presence[[URL='https://en.wikipedia.org/w/index.php?title=Iridium&action=edit§ion=12']edit[/URL]][/B][/SIZE] [ATTACH=full]1245350[/ATTACH] The red arrow points to the [URL='https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary']Cretaceous–Paleogene boundary[/URL]. Main article: [URL='https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event']Cretaceous–Paleogene extinction event[/URL] The [URL='https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary']Cretaceous–Paleogene boundary[/URL] of 66 million years ago, marking the temporal border between the [URL='https://en.wikipedia.org/wiki/Cretaceous']Cretaceous[/URL] and [URL='https://en.wikipedia.org/wiki/Paleogene']Paleogene[/URL] periods of [URL='https://en.wikipedia.org/wiki/Geologic_time_scale']geological time[/URL], was identified by a thin [URL='https://en.wikipedia.org/wiki/Stratum']stratum[/URL] of [URL='https://en.wikipedia.org/wiki/Iridium_anomaly']iridium-rich clay[/URL].[URL='https://en.wikipedia.org/wiki/Iridium#cite_note-Alvarez-63'][61][/URL] A team led by [URL='https://en.wikipedia.org/wiki/Luis_Walter_Alvarez']Luis Alvarez[/URL] proposed in 1980 an extraterrestrial origin for this iridium, attributing it to an [URL='https://en.wikipedia.org/wiki/Asteroid']asteroid[/URL] or [URL='https://en.wikipedia.org/wiki/Comet']comet[/URL] impact.[URL='https://en.wikipedia.org/wiki/Iridium#cite_note-Alvarez-63'][61][/URL] Their theory, known as the [URL='https://en.wikipedia.org/wiki/Alvarez_hypothesis']Alvarez hypothesis[/URL], is now widely accepted to explain the extinction of the non-avian [URL='https://en.wikipedia.org/wiki/Dinosaur']dinosaurs[/URL]. A large buried impact crater structure with an estimated age of about 66 million years was later identified under what is now the [URL='https://en.wikipedia.org/wiki/Yucat%C3%A1n_Peninsula']Yucatán Peninsula[/URL] (the [URL='https://en.wikipedia.org/wiki/Chicxulub_crater']Chicxulub crater[/URL]).[URL='https://en.wikipedia.org/wiki/Iridium#cite_note-64'][62][/URL][URL='https://en.wikipedia.org/wiki/Iridium#cite_note-65'][63][/URL] Dewey M. McLean and others argue that the iridium may have been of [URL='https://en.wikipedia.org/wiki/Volcano']volcanic[/URL] origin instead, because [URL='https://en.wikipedia.org/wiki/Earth']Earth[/URL]'s core is rich in iridium, and active volcanoes such as [URL='https://en.wikipedia.org/wiki/Piton_de_la_Fournaise']Piton de la Fournaise[/URL], in the island of [URL='https://en.wikipedia.org/wiki/R%C3%A9union']Réunion[/URL], are still releasing iridium.[/QUOTE]
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