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Vol. 5, No. 6 June 1995 GSA TODAY A Publication of the Geological Society of America 1995 ANNUAL MEETING New Orleans, Louisiana • November 6–9 ABSTRACTS DUE JULY 12 For abstract forms (303) 447-2020, ext. 161; E-mail: [email protected] SOFTWARE FAIR PROPOSALS DUE SEPTEMBER 1 For information: (504) 286-6791; fax 504-286-7396; E-mail: [email protected] PREREGISTRATION DUE SEPTEMBER 29 Registration and housing forms enclosed INFORMATION (303) 447-2020, ext. 184 or 1-800-472-1988; fax 303-447-0648; E-mail: [email protected] he theme for the 1995 Annual Meeting is Bridging the Gulf. This theme has several meanings. In particular, we will draw attention to the Gulf of Mexico–Caribbean, and the surrounding T American continents, bridging the knowledge gap that exists across a region divided by polit- ical boundaries and language but sharing a common geologic framework. Bridging the Gulf also addresses the need to develop a closer link between technology and the science of geology and to educate the public on issues critical to the development of intelligent policies on the environment and geologic hazards. We also hope to bridge the gulf between the past and the future with both a retrospection on the past 25 years of plate tectonics and a look at the future as geology responds to society’s needs. Finally, we view the city of New Orleans, the Mississippi River and its delta, and the Gulf Coast as a laboratory where the long- term effects of humans on the environment can be examined. NEW ORLEANS: The Crescent City–New Orleans is nestled on the inside of a south-looping meander of the Mississippi River. The early city (Vieux Carré or French Quarter) was built on the Mississippi’s natural levee, and then expanded up, down, and across the river, and later northward through the swamp to the south shore of Lake Pontchartrain. New Orleans is especially noted for its cuisine and music, both of which have been influenced by the French, Spanish, African, English, and Native Americans who have made the city and its surrounding waterways their home. Come this November and discover the grace and charm of America’s most unusual city. Bill Craig General Chairman GSA DIVISIONS Archaeological Geology • Coal Geology • Engineering Geology • Geophysics • Geoscience Education • History of Geology • Hydrogeology • International • Planetary Geology • Quaternary Geology and Geomorphology • Sedimentary Geology • Structural Geology and Tectonics ASSOCIATED SOCIETIES Association for Women Geoscientists • Association of American State Geologists • Association of Geoscientists for International Development • Cushman Foundation • Geochemical Society • Geoscience Information Society • Mineralogical Society of America • National Association for Black Geologists and Geophysicists • National Association of Geology Teachers • National Earth Science Teachers Association • Paleontological Research Institute • Paleontological Society • Sigma Gamma Epsilon • Society of Economic Geologists • Society of Vertebrate Paleontology GSA TODAY June Vol. 5, No. 6 1995 GSA TODAY (ISSN 1052-5173) is published monthly by The Geological Society of America, Inc., with offices at 3300 Penrose Place, Boulder, Colorado. Mailing address: P.O. Box 9140, Boulder, CO 80301- 9140, U.S.A. Second-class postage paid at Boulder, Colorado, and at additional mailing offices. Postmas- ter: Send address changes to GSA Today, Membership Services, P.O. Box 9140, Boulder, CO 80301-9140. Copyright © 1995, The Geological Society of America, Inc. (GSA). All rights reserved. Copyright not claimed on content prepared wholly by U.S. Government employees within the scope of their employment. Per- mission is granted to individuals to photocopy freely all items other than the science articles to further science and education. Individual scientists are hereby granted permission, without royalties or further requests, to make unlimited photocopies of the science articles for use in classrooms to further education and science, and to make up to five copies for distribution to associates in the furtherance of science; permission is granted to make more than five photocopies for other noncom- mercial, nonprofit purposes furthering science and edu- cation upon payment of the appropriate fee ($0.25 per page) directly to the Copyright Clearance Center, 27 Congress Street, Salem, Massachusetts 01970, phone (508) 744-3350 (include title and ISSN when paying). Written permission is required from GSA for all other forms of capture, reproduction, and/or distribution of any item in this journal by any means. GSA provides this and other forums for the presentation of diverse opinions and positions by scientists worldwide, regard- less of their race, citizenship, gender, religion, or politi- cal viewpoint. Opinions presented in this publication do not reflect official positions of the Society. SUBSCRIPTIONS for 1995 calendar year: Society Members: GSA Today is provided as part of membership dues. Contact Membership Services at Hurricane Andrew courtesy of (800) 472-1988 or (303) 447-2020 for membership information. Nonmembers & Institutions: Free with LSU Earth Scanning Labora- paid subscription to both GSA Bulletin and Geology, tory. Data from NOAA. otherwise $45 for U.S., Canada, and Mexico; $55 else- where. Contact Subscription Services. Single copies may be requested from Publication Sales. Also available on an annual CD-ROM, (with GSA Bulletin, Geology, TABLE OF CONTENTS GSA Data Repository, and an Electronic Retrospective Index from 1972-to-current) for $89 to members, $125 to others; and in an annual, hardbound, library edition Abstracts with Programs . 136 for $45. Order from Membership Services. Claims: For nonreceipt or for damaged copies, members contact Convenience Information . 134 Membership Services; all others contact Subscription Services. Claims are honored for one year; please allow Earth Scientists on Capitol Hill . 125 sufficient delivery time for overseas copies. Education Programs K–16 . 126 STAFF Prepared from contributions from the GSA staff and Employment Service . 125 membership. Executive Director: Donald M. Davidson, Jr. Exhibits . 129 Science Editor: Eldridge M. Moores Department of Geology, University of California, Field Trips . 123 Davis, CA 95616 Forum Editor: Bruce F. Molnia Graduate School Information Forum . 125 U.S. Geological Survey, MS 917, National Center, Reston, VA 22092 Guest Program . 128 Managing Editor: Faith Rogers Production & Marketing Manager: James R. Clark Production Editor and Coordinator: Joan E. Manly Hotels . 131 Graphics Production: Joan E. Manly, Kim Thomas Membership . 135 ADVERTISING Classifieds and display: contact Ann Crawford Professional Horizons—GSA Continuing Education Courses, (303) 447-2020; fax 303-447-1133 Short Courses, Forums, Workshops . 118 This publication is included on GSA’s annual CD-ROM, Registration . 134 GSA Journals on Compact Disc, and also is available in an annual, hardbound, archival edition. Call GSA Publica- Special Events . 127 tion Sales for details. Printed with pure soy inks on recyclable paper Technical Program . 115 in the U.S.A. Travel . 130 1995 ANNUAL MEETING COMMITTEE General Chair . William W. Craig . University of New Orleans Co-Chair. William (Skip) B. Simmons, Jr. University of New Orleans Combined Publishers’ Display Coordinator. Gary Allen. University of New Orleans Computer Technology Program Chair. Mike Fogarty . Exploration Systems, Inc., New Orleans Resources Chair . Edward B. Picou, Jr. New Orleans Education Programs Coordinator. Marilyn Saponara . Bonnabel High School, Metairie, Louisiana Environmental Programs Coordinator . George Flowers . Tulane University Field Trip Chair. Whitney Autin . Louisiana State University Co-Chair. Duncan Goldthwaite . Metairie, Louisiana Guest Program Chair . Pat Craig . New Orleans Co-Chair. Karen Webber. University of New Orleans Student Assistants Chair . Bill Busch . University of New Orleans Co-Chair. Kraig Derstler. University of New Orleans Technical Program Chair . Laura Serpa. University of New Orleans Co-Chair. Terry Pavlis. University of New Orleans 114 Web Site: http//www.aescon.com/geosociety/index.html GSA TODAY, June 1995 TECHNICAL PROGRAM Call for Papers and Announcement of Symposia and Theme Sessions ABSTRACT DEADLINE: JULY 12 Daily technical session schedule: September issue of GSA Today and the S6. Third International Symposium on the Ceno- World Wide Web: http//www.aescon.com/geosociety/index.html. If you are zoic Tectonics and Volcanism of Mexico. Tuesday, November 7, afternoon. not a GSA member, please call, fax, E-mail, or write us, and we will gladly 1995 GSA Annual Meeting Committee. Jorge send you the schedule after September 1. Nieto-Obregon, Universidad Nacional Autónoma de México. S7. Quaternary Geologic Framework and Processes of Coastal Land Loss in Louisiana. ABSTRACT SUBMITTAL GUIDELINES Wednesday, November 8, afternoon. Quaternary 1995 ABSTRACT FORMS AVAILABLE FROM: Geology and Geomorphology Division and Engi- neering Geology Division. S. Jeffress Williams, • Abstracts Coordinator at GSA headquarters U.S. Geological Survey, Reston; Shea Penland, • Conveners of symposia Louisiana State University. • Advocates of theme sessions • Geoscience departments of most colleges and universities S8. The Mississippi River as a Sedimentary • Main federal and state survey offices System. Tuesday, November 7, afternoon. Sedimentary PRESENTATION FORMATS Geology Division. Whitney J. Autin, Louisiana Format Abstracts Procedure State University; Andres