Number 102 (Story #2), November 10, 1992 by Phillip F. Schewe and Ben Stein DID A METEOR KILL THE DINOSAURS? A new study provides additional support for the idea that a buried impact basin on the Yucatan peninsula was the site of an impact that was fatal to many life forms at the (KT) boundary between the Cretaceous and Tertiary periods 65 million years ago. Scientists from the Lunar and Planetary Institute (Houston), the U.S. Geological Survey (Menlo Park, CA), and Geophysical Institute (Mexico City) report new studies of melted rock, showing that the levels of iridium and the ratios of argon isotopes at the Yucatan crater agree with those of KT samples from around the world. (Nature, 29 Oct. 1992.) In contrast, other scientists, such as Charles Officer of Dartmouth, continue to assert that an impact may not have been the culprit and that instead certain artifacts, such as anomalous iridium, could be produced in volcanic eruptions. (Science News, 7 Nov. 1992.)