The Cretaceous/Tertiary boundary interval, Raton Basin, Colorado and New Mexico, and its content of shock-metamorphosed minerals; Evidence relevant to the KIT boundary impact-extinction theory Glen A. Izett

CLEAR CREEK NORTH SITE, COLO

ICoa/

Impact Layer,

C/aysfoneB|

Carbonaceous HS/ia/eK

SPECIAL PAPER 249

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The Cretaceous/Tertiary boundary interval, Raton Basin, Colorado and New Mexico, and its content of shock-metamorphosed minerals; Evidence relevant to the K/T boundary impact-extinction theory

Glen A. Izett U.S. Geological Survey M.S. 913, Box 25046 Denver Federal Center Denver, Colorado 80225

5FEC1IIPAPEH 249

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Library of Congress Cataloging-in-Publication Data Izett, Glen Arthur, 1928- The Cretaceous/Tertiary boundary interval, Raton Basin, Colorado and New Mexico, and its content of shock-metamorphosed minerals : evidence relevant to the K/T boundary impact-extinction theory / Glen A. Izett. p. cm.—(Special paper / Geological Society of America ; 249) Includes bibliographical references. ISBN 0-8137-2249-7 1. Cretaceous/Tertiary boundary—Raton Basin (Colo, and N.M.) 2. Geology—Raton Basin (Colo, and N.M.) 3. Mineralogy—Raton Basin (Colo, and N.M.) I. Title. II. Series: Special papers (Geological Society of America); 249. QE689.I94 1990 551,7'7'0978896—dc20 90-3737 CIP

Cover photos: Front, K/T interval from the Clear Creek North site, Colorado (Continental rocks in western United States). Back, K/T interval from the Stevns Klint, Denmark, site (Marine rocks in Europe).

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