Encyclopedia Article

Walter Alvarez - Research Article from Science and Its Times

This encyclopedia article consists of approximately 1 page of information about Walter Alvarez.
This section contains 82 words
(approx. 1 page at 300 words per page)

American geologist who, with his father, Louis, discovered evidence that a large impact was the most likely cause of the mass extinction of dinosaurs. Alvarez analyzed samples from the Italian mountains that were deposited at the boundary between the Cretaceous and Triassic periods (known to geologists as the "KT boundary") and noticed high levels of iridium, commonly found in meteorites. This led to his discovery that a large meteor or a small asteroid impact caused the dinosaurs' extinction.

This section contains 82 words
(approx. 1 page at 300 words per page)
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Walter Alvarez from Gale. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.