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<br />~ . <br />"'~j <br />~,~ "\'" ."~ <br />U.S. Department of the Irft~rior <br /> <br />Gale A. Norton, Secretary <br /> <br />U.S. Geological Survey <br />Charles G. Groat, Director <br /> <br />Any use at trade, product, or 1irm names in this publication <br />is for descriptive purposes only and does not imply endorsement <br />by the U.S. Government. <br /> <br />United States Government Printing Office: 2005 <br /> <br />For additional copies please contact: <br /> <br />USGS loformalioo Services <br />Box 25286 <br />Denver, CD 80225 <br /> <br />This report and any updates to it are available at: <br />hnp:/Ipubs.usgs.gov/sirI200515072 <br /> <br />Additional USGS publications can be found at <br />hnp:/Igeology.usgs.gov/prod ucts. him I <br /> <br />For more information about the USGS and its products: <br /> <br />Telephone: HI88-ASK-USGS (1-888-275-8747) <br />World Wide Web: hnp~/www.usgs.gov/ <br /> <br />Manuscript approved for publication, April 5, 2005 <br />Text edited by Peter H. Stauffer <br />Layout and design by Stephen L Scon <br /> <br />H - Cat;l~gl;g-i-n-Publication dat-a ar-e on file with the Library of Congres.s <br />