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 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/957377/spe249-fm.pdf by guest on 27 September 2021 G.S.A. ARCHIVES 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 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/957377/spe249-fm.pdf by guest on 27 September 2021 © 1990 The Geological Society of America, Inc. All rights reserved. All materials subject to this copyright and included in this volume may be photocopied for the noncommercial purpose of scientific or educational advancement. Copyright is not claimed on any material prepared by government employees within the scope of their employment. Published by The Geological Society of America, Inc. 3300 Penrose Place, P.O. Box 9140, Boulder, Colorado 80301 GSA Books Science Editor Richard A. Hoppin Printed in U.S.A. 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). Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/957377/spe249-fm.pdf by guest on 27 September 2021.