PREFACE. 19 



done more to further the development of the mineral resources 

 of Missouri than any other citizen of the State ; Prof. G. C. 

 Broadhead, of the State University, former State Geologist, 

 who, owing to his connection with the earlier Surveys, is better 

 acquainted with the geology of Missouri than any other per- 

 son now living; and Prof. E. M. Sheppard, acting president of 

 Drury college, Springfield, whose wide experience in the south- 

 western part of the State has lightened, greatly, the work 

 which was carried on in this section. 



For efficient aid in supplying material and information, 

 special expression of obligations must be made to : 



Prof. William B. Potter, Washington University, St. Louis. 



Mr. E. A. Blair, Sedalia. 



Mr. F. A. Sampson, Sedalia. 



Mr. James D. Robertson, St. Louis. 



Mr. R. R. Rowley, Louisana. 



Mr. Sid. J. Hare, Kansas City. 



Mr. D. H. Todd, Kansas City. 



Mr. E. T. Keim, Kansas City. 



Rev. John Davis, Hannibal. 



Prof. 0. D. Walcott, Director of U. S. Geological Survey, 

 Washington, D. C. 



Dr. C. A. White, U. S. National Museum, Washington, D. C. 



Prof. H. S. Williams, Yale College, New Haven, Conn. 



Dr. R. P. Whitfield, American Museum of Natural History, 

 New York City. 



Dr. James Hall, State Geologist, Albany, N. Y. 



Mr. Charles Wachsmuth, Burlington, Iowa. 



Prof. Samuel Calvin, State University, Iowa City, Iowa. 



Dr. Erasmus Haworth, State University, Lawrence, Kas. 



For the faithful and accurate delineations of the fossils 

 submitted to them, the Survey is under obligations to Dr. J. 

 C. McConnell, Washington, D. C, and Mr. Magnus Westergren, 

 Cambridge, Mass. 



