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https://newscenter.lbl.gov/2010/03/09/alvarez-theory-on-dinosaur/
Mar 09, 2010 · Alvarez Theory on Dinosaur Die-Out Upheld: Experts Find Asteroid Guilty of Killing the Dinosaurs. ... it seems like a good time to take a look back at how the Alvarez asteroid theory came to be. The Iridium Anomaly. The story begins in 1977 in Gubbio, Italy, a tiny village halfway between Rome and Florence, where geologist Walter Alvarez was ...
https://www2.lbl.gov/Science-Articles/Archive/dinosaur-extinction.html
But until the discovery of the iridium anomaly at LBL, there was no direct evidence to support an extraterrestrial theory. Once the anomaly was discovered, the problem was to find a source that would deliver the extra iridium and was capable of causing the world-wide extinctions.
https://en.wikipedia.org/wiki/Alvarez_hypothesis
The Alvarez hypothesis posits that the mass extinction of the dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.Prior to 2013, it was commonly cited as having happened about 65 million years ago, but Renne and colleagues (2013) gave an updated value of 66 million years.
https://www.scientificamerican.com/article/asteroid-killed-dinosaurs/
Mar 04, 2010 · A Theory Set in Stone: An Asteroid Killed the Dinosaurs, After All. A single asteroid impact near the Yucatan remains the best explanation for the massive Cretaceous-Paleogene extinction ...
https://undsci.berkeley.edu/lessons/pdfs/alvarez_woflow.pdf
Asteroids and dinosaurs: Unexpected twists and an unfinished story Plate tectonics might seem like a routine topic from a 7th grade textbook, but in the 1970s, plate tectonics was cutting-edge science. The theory had only gained widespread acceptance over the previous ten years and subsequently attracted scads of scientists looking to
https://www.thenakedscientists.com/forum/index.php?topic=14388.0
Aug 05, 2008 · There is also the fact that the asteroid belt in this universe - exclusive of asteroids coming in from outside the solar system - is consider by many to have been a shattered planet that had formed between Earth and Mars but was subsequently hit by a comet larger than most and came apart. This theory has been around for a while.
https://astronomy.stackexchange.com/questions/20974/do-comets-contain-any-significant-amounts-of-iridium
I have Googled "iridium content of comets" and can't find anything that suggests comets contain iridium in any detectable quantities. Yet, whenever I read an article about the Chicxulub impactor, the article invariably says something to the effect that it may have been created by an asteroid or a comet.But Alvarez and company first offered the impact hypothesis for the K-T extinction by ...
http://geolor.com/Iridium_Evidence-Impacts-Extinctions.htm
Iridium amounts found in the area of the Australian Bedout crater were very small compared to those associated with the asteroid impact that formed the crater believed responsible for the K-T extinctions. There simply are no obvious Iridium spikes to support a major impact event as the sole cause of the Permian die-offs.
https://quizlet.com/22983719/impacts-and-extinctions-chapter-14-flash-cards/
The mass extinction event at this boundary (including the death of the dinosaurs) is thought to have been completed by a meteorite impact, though the environment was stressed from volcanic eruptions and diverging plates before the impact. The impact of the asteroid led to a global catastrophic killing.
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