Dr. J. S. Newberry, Chief Geologist: 



Dear Sir: — I hereby submit reports on the following counties: Butler, Warren, 

 Preble, Greene, Madison, Franklin, 1 Pike, Ross, Fayette, Clinton, Shelby, Miami 

 Champaign, Logan, Brown, and Darke. These lists comprise all of the counties 

 originally assigned to me in the division of the State into geological districts that have 

 not been already reported upon, together with those that have been subsequently 

 added to my district. 



The reports on the eight counties that compose the first division, I have written ; 

 the remainder are to be credited to the several local assistants whose names are pre 

 fixed. 



I take this opportunity of acknowledging the competent services of Mr. Franklin 

 C. Hill, Mr. J. Y. Bergen, Jr., and Prof. C. M. Galloway, who were employed for 

 several months each on counties which I have examined. The geology of the west- 

 ern half of Ross county was principally worked out by Mr. Bergen, and the defini- 

 tion of the valleys, modern and ancient, of the Great a,nd Little Miamis, is due to the 

 united labors of Messrs. Bergen and Galloway. 



I have been laid under weighty obligations for local guidance and hospitable enter- 

 tainment to a great number of people in south-western Ohio during the progress of 

 the Survey, but in almost every county that I have personally examined there are 

 some gentlemen that have given me such important aid in my work that I should do 

 wrong if I failed to make a public acknowledgment of their services. In this list I 

 will name Messrs. J. Kelly O'Neal, Israel Harris, W. H. Bean, Drs. Aaron Wright 

 .and W. L. Schenck, of Warren county ; Hon. W. D. Gilmore, Capt. W. L. Shaw, Thos. 

 Pottinger, Esq., and the late Dr. Dunham, of Preble county ; R. G. Dun, Esq., and 

 Drs. John Beach and W. A. Beach, of Madison county ; and Messrs. Maurice Reiche, 

 J. T. Moore, Joseph Foster, H. W. Overman, and James McBride, of Pike county. 

 With great respect, very truly yours, . 



Edward Ohton, 



Assistant Geologist. 



Columbus, Ohio, Dec. 3, 1874. 



