x PREFACE. 
cases adopt the constructions which I have placed upon these facts. In naming 
them, therefore, I do not, in any way, seek to represent them as committed to 
my interpretations of geological order or economic significance. The list includes 
Messrs. R. M. Haseltine and Jonathan Head, of Youngstown; William Wetmore: 
of Canfield; Anthony Howells, of Massillon; J. G. Chamberlain, of Leetonia; Andrew 
Lee, of Sherrodsville; William Smurthwaite, of Steubenville; Thomas Corcoran, of 
Corning; James Taylor, of New Lexington; Thomas M. Black, of Buchtel, and John 
Campbell, of Ironton. ; 
The officers of the various railroad lines that cross or that give access to our coal 
fields have rendered important aid to the Survey by giving free transportation to 
myself and my assistants while engaged in this work. The appropriations made by 
the Legislature would have been quite inadequate for the unexpected amount of 
labor with which I found myself burdened had it not been for this liberal policy on 
the part of the railroads. 
Special acknowledgments are due to the gentlemen named below: 
Messrs. B. Dunham and G. J. Foreacre, Baltimore & Ohio R. R.; Orland Smith, 
Cincinnati, Washington & Baltimore R. R.; N. Monsarrat, Cleveland, Akron & Co- 
lumbus R. R.; J, H. Devereux, Cleveland, Columbus, Cincinnati & Indianapolis 
R’y ; Oscar Townsend, Cleveland, Lorain & Wheeling R. R.; M. D. Woodford, Cleve- 
land & Marietta R. R.; M. M. Greene, Columbus, Hocking Valley & Toledo R’y; 
Sam. Briggs, Connotton Valley R’y; John Newell, Lake Shore & Michigan Southern 
R’y; J. M. Ferris, New York, Penn’a & Ohio R. R.; J. E. Martin, Ohio Central R. R.; 
Geo. Skinner, Scioto Valley Railway; J. E. Turk, Valley Railway; M. D. Woodford, 
Wheeling & Lake Erie R. R. 
A few things remain to be said, which are of a somewhat personal character. 
I gave a promise to members of the 65th General Assembly, that this volume, for . 
the preparation and publication of which they had made the necessary provision, 
should be issued in 1883, so that its distribution should be in their hands. Subse- 
quent to the adjournment of the Legislature, however, I was made to believe thatiI 
could render a better service to the {state by accepting for the summer a place 
on what is known as the Mining Screen Commission, provision for which was made 
by the same General Assembly, and the work of which was in part germane to my 
investigations in economic geology, than by pressing the volume to immediate issue. 
By this delay, the volume has gained 60 per cent. upon my original estimate of 700 
pages, the whole having been kept, however, within the appropriations made for a 
volume of that size. It is a pleasure to add that 1000 copies of the volume are to be 
placed on sale in the Secretary of State’s Office, at the actual cost of publication. If 
the whole edition were so placed, it would ensure a much better distribution than 
the previous volumes of the Geological Survey have had. 
I bespeak for the volume a kindly and candid reception. Its deficiencies of plan 
and execution, which are many, are better known to me than they will be to any 
critic. The responsibility for the volume has, however, been so;placed by the Legis- 
lature that I cannot charge them over to any other person or party. Draughtsman, 
