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Article: Rare amino acids support impact theory. (Cretaceous-Tertiary boundary composition)
- Article from:
- Science News
- Article date:
- June 10, 1989
- Author:
CopyrightCOPYRIGHT 1989 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Rare Amino Acids Support Impact Theory
For a decade, geologists and paleontologists have debated whether comet or meteorite impacts 65 million years ago wiped out a large fraction of existing species, including the last surviving dinosaurs. A rival theory holds that terrestrial processes such as volcanic eruptions caused the mass extinctions of that time, known as the Cretaceous-Tertiary (K-T) boundary. This week, scientists reported a startling new piece of impact evidence from the boundary -- extraterrestrial amino acids.
"The fact that we detect these amino acids, I think, makes the impact hypothesis really solid," says chemist Jeffrey L. Bada of the ...
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