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Line 1: − + − One explanation suggested was that it was the result of a meteor impact, but this idea was challenged on the grounds that no crater had been found. + − + − A Meteor Impact which scientists claim occurred about Scientists theorize it resulted in the extinction of all non-avian [[dinosaurs]].
Cretaceous-Tertiary Mass Extinction (view source)
Revision as of 07:20, April 24, 2007
, 07:20, April 24, 2007Added chicxulub, source, deleted not-a-sentence
Evolutionary biologists and geologists generally believe that a mass extinction of dinosaurs happened 65 million years ago at the end of the [[Cretaceous Period]].
Evolutionary biologists and geologists generally believe that a mass extinction of [[dinosaurs]] and other organisms happened 65 million years ago at the end of the [[Cretaceous Period]]. The primary cause of this extinction is generally believed to be an asteroid or comet impact, linked to the large crater found off the Yucatan Peninsula.<ref>[http://www.lpl.arizona.edu/SIC/impact_cratering/Chicxulub/Discovering_crater.html Chicxulub Impact Event: Discovering the Crater.] Accessed April 24, 2007.</ref>
==References==
<references/>
==External links==
==External links==