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0 <br />ii <br />0 <br />ACKNOtZEDGEMENTS <br />This research was made possible by a grant from the U.S. National <br />Park Service. In addition, the logistical support and cooperation <br />furnished by Mr. Steve Petersburg and personnel at Dinosaur National <br />Monument was an invaluable aid in the completion of this work. <br />i <br />I owe a dept of gratitude to Dr. John Neuhold for the guidance <br />and encouragement he offered throughout this project. The technical <br />. support and ideas of Drs. Vince Lamarra and Dean Adams were of great <br />value in organizing and carrying out research at all stages. <br />Data offered by Bio-West, Inc. of Logan, Utah, for inclusion in <br />portions of this research saved much time and energy and was greatly <br />appreciated. <br />Others who deserve recognition for providing technical assistance <br />. and enduring the rigors of field trips include Arcadio Valdes-Gonzalez, <br />Ben Steele, Alice Wywialowski, and Jeff Nelson. <br />Most importantly, I offer a special thank-you to my wife Lynn for <br />her help in reviewing the text as well as her encouragement and under- <br />standing for the past two years. <br />Thomas C. Annear <br />C <br />0 <br />0