72 



INDEX. 



Page. 

 Dolomite, absence of t"i3 



character of 38 



Bowney dike, fiuorine in G.") 



Downey's bluff, fault at 35 



rocks at and near 23,29 



E. 



Eichorn, mines near r>2 



rocks near 22 



Eilers, Anton, and Raymond, on Fairview 



mine 44-4r) 



on Fairview rocks 24 



on galena 38 



I in lead mining 12 



on stibnite 39 



Elevations in Illinois district, statement of. 15 



Elizabethtown, faults near 32 



fluorspar mines near 11 



rocks near 21 , 39 



Emmons, S. F., on Fairview mine 44 



on fluorine G4 



on fluorspar 13 



on ore deposits .57 



on replacement 41 



Empire mine, description of 48-50 



faults at 31, 33, 41 



rocksin 31,41 



Engelmann, Henry, on Cypress sandstone . 23 



on Illinois geology 18 



on Kentucky-Illinois district 13 



on St. Louis limestone 21 



Engelmann and Worthen, on Ste. Genevieve 



limestone 22 



Erosion, periods of 35-36 



Eureka mine, description of 58 



r. 



Fairview Fluorspar Company, property of. 12.44,47 



Fairview mine, description of 44-15 



developments at, disclosures of 40 



fault at 33 



rocks at 24, 41 



Faulting, character of 32-33 



detection of 70 



occurrence of 21, 



24, 25, 31-33, 41-12, 47-48, 57-58, 60 



significance of 63 



Ferruginous sandstone, equivalents of 23 



Flannery dike, location of 27 



Fluate of lime, occurrence of 12-13 



Fluorite, character of 36-37 



occurrence of 36-37, 63-65 



character and occurrence of 36-37 



discovery of 12 



prices and uses of 67-69 



sources and production of 61-70 



Fluorsparand limestone, interbanded, view 



of 54 



Fluorspar band, photomicrographs of 56 



photomicrographs of, comment on 54, 57 



Fobs, F. Julius, acknowledgments to 27 



on ankerite 38 



Formations of southern Illinois, table of . . . 18 



Fossils, occurrence of 19-24 



Fredonia member, equivalent of 22 



occurrence and character of 22 



G. Page. 



Galena, analyses of 62 



character of 38 



concentration of 62 



occurrence of 12, 26, 36, 60 



Galena, 111., galena from near, analysis of . 62 



Gallatin County, faults in 32 



topography in 15 



Geologic work, in district, .summary of 13-14 



Geology of Illinois district, account of 17-36 



Gilbert, G. K., on diverse displacement 33 



Gilbert dike, location of 60 



Glass spar. Sec Fluorspar. 



Golconda, mines near 58 



prospects near GO 



rocks near 30 



Good Hope shaft, opening of 44 



Gordon mine, description of .54 



location of .58 



Grand Pierre Creek, location and charac- 

 ter of 17 



Grand Pierre Mining Company, work of . . . 50 

 Gulf Plateau, extension of, in Kentucky- 

 Illinois district 14 



topography of 14 



H. 



Hamp mine, discription of 52 



faults at 33,41 



rocks in 41 



Hard dike, fluorine in 65 



Hardin County, dome in 31 



mines and prospects in, descriptions 



of 11,52-58 



ore deposits in, character of 36 



rocksin 17,19-23,25 



topography of 14-15 



Hayes, C. W., letter of transmittal by 9 



on Interior Lowland 14 



Hayes and Ulrich, on faulting 33 



Hicks, dome near 31 



faults near 21 



rocks near 19-22, 27 



Hicks Branch, rocks on 19, 31 



Hicks area, geologic map of 22 



geology of, TL'sumd of 48 



mines and prospects of 48-.52 



Hicks mine, description of 52 



History, geologic, sketch of 34-36 



Hobbs, W. H., on faulting 33 



Hog Thief Branch, fault near 32 



Hubbard shaft, description of 50 



Hutchinson, James, mine of, description of. 51 



I. 



Igneous rocks, deformation and intrusion 



of. history of 35 



occurrence of 17-27, 43 



significance of 63 



Illinois, fluorspar production of 68 



limestones from, analysis of 65 



Indiana geological survey, on Mansfield 



sandstone 26 



Interior Lowland, location of 14-15 



topography of 15 



Iron, oxide of, occurrence of 39 



