Many people have assisted in the preparation of The Geologic Story of Palo Duro Canyon, and their help is gratefully acknowledged: Professor Jack T. Hughes, Dr. Frank W. Daugherty, Dr. Robert C. Burton, Meade Humphries, and Jim Hughes of the West Texas State University Geology Department provided much information about the area and assisted in the field; help was also provided by Mr. Pete Cowart, Mr. Earl Burtz, Mr. Jerry Tschauner, Mr. Bob Watson, Mr. King, and other park personnel; Mr. C. Boone McClure, of the Panhandle-Plains Historical Museum, furnished some of the photographs; Mr. J. Dan Scurlock, Mr. Bill Collins, and Mr. Harold Allums, of the Texas Parks and Wildlife Department, made available certain maps and statistical data; Mrs. Ples Harper of Canyon assisted in assembling information and photographs for the Pioneer Amphitheatre; and the aerial photograph of Palo Duro Canyon was taken by Mr. W. A. Hester and made available through the courtesy of Mr. Charles A. Wolflin of Amarillo.

Drs. Peter T. Flawn, Peter U. Rodda, and Ross A. Maxwell of the Bureau of Economic Geology read much of the manuscript and offered many helpful suggestions, and Mr. A. Richard Smith provided special information on caves in the Palo Duro area. Special thanks are due to Miss Josephine Casey who edited the manuscript and to Mr. J. W. Macon, cartographer, who assumed responsibility for preparing the maps. Thanks are due also to my wife, Jennie, who critically read the manuscript and took a number of the photographs. Finally, I would like to thank Dr. J. Daniel Powell of The University of Texas at Arlington for invaluable assistance in the field and his enthusiastic co-operation throughout the project.