LEAD, ZINC, AND FLUORSPAR DEPOSITS OF WESTERN KEN- 
TUCKY. 
By E. O. Ulrich and W. S. Tangier Smith. 
GEOLOGY AND GENERAL RELATIONS. 
By E. O. Ulkich. 
INTRODUCTION. 
During the summer and fall of 11)02 a party consisting of the writer 
and Dr. W. S. Tangier Smith, with two field assistants, Messrs. A. F. 
Crider and F. Julius Fohs, was engaged in an extended investigation 
of the zinc, lead, and other valuable mineral deposits of western 
Kentucky and, in less detail, of those occurring on the northern side 
of the Ohio River in Pope and Hardin counties, 111. The latter 
counties, together with the counties of Crittenden, Livingston, Cald- 
well, and adjacent portions of Christian, Trigg, and Lyon, in Ken- 
tucky, are embraced in a lead and zinc district differing in several 
respects from the other lead and zinc districts of the Mississippi 
Valley. This district differs from the others in the presence of basic 
igneous dikes, in the ores -occurring principally along fault lines in 
true fissure veins, and, finalty, in having the lead and zinc ores almost 
invariably associated with fluorite, the latter as a rule forming the 
most abundant gangue mineral. 
The recent work in western Kentucky consisted largely in the 
verification and correction of the mostly unpublished results of a 
study of the geology of the three counties of Caldwell, Crittenden, 
and Livingston carried on by the writer in 1889 and 1890, while a 
member of the geological survey of Kentucky. The developments of 
the past decade permitted us to add many new observations and to 
advance the geologic knowledge of the district to a point where it is 
possible to describe the ore deposits and the systems of fractures and 
faults in and along which they occur as well as the geologic forma- 
tions and their geographic distribution in considerable detail. The 
following brief statement, however, is to be viewed merely as an 
advance publication of results and conclusions that will be more fully 
described, and will be illustrated, in a report now in preparation. 
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