II 



INDEX. 



Coal shaft, Braidwood 213 



Coal shaft, Martin's, Mercer county 803 



Coal shaft, Bradford, Stark county 327 



Coal shaft, S. C. Francis', Stark county. .326 



Coal shaft, Metamora 337 



Coal shaft, Minonk 338 



Cladodus deflexus 355 



Cladodus elegans 354 



Cladodus ischypus 354 



Cochliodus costatus 364 



Cordaites angustifolia 420 



Ctenacanthus Mayi 872 



Cymatodus 363 



Cymatodus oblongus 364 



DeKalb, Kane and Dupage counties, geolo- 

 gy of HI 



DeKalb, Kane and DuPage counties, arte- 

 sian well in 114 



DeKalb, Kane and DuPage counties, Nia- 

 gara group in 114 



DeKalb, Kane and DuPage counties, Cin- 

 cinnati group in 121 



DeKalb, Kane and DuPage counties, Tren- 

 ton group in 122 



DeKalb, Kane and DuPage counties, econo- 

 mical geology of 123 



Deltodus alatus 368 



Deltodus angustus 368 



Deltodus fasciatus 366 



Deltodus Littoni 367 



Dictyopteris 388 



Dictyopteris rubella 388 



Edestus Heinrichsii. 850 



Edestus vorax 350 



Edgar county, geology of 266 



Edgar county, section of rocks in 267 



Equisetites 425 



Equisetites occidentalis 425 



Fossil fishes, remarks on 345 



Fossil plants 377 



Fossil plants, distribution of. 500 



Fossil plants, list of 471 



Fossil plants, preserved in coaP 478 



Fossil plants, preserved in shale 479 



Fossil plants, preserved in concretions. . .481 

 Fossil plants, preserved by mineralization.488 

 Fossil plants, affinities of 489 



Fulton county, geology of. 90 



Fulton county, Coal Measures in 93 



Fulton county, conglomerate in 102 



Fulton county, St. Louis limestone in. . . .103 

 Fulton county, economical geology of. . . .103 

 Fulton county, list of trees in '. . 109 



Grundy county, geology of. 190 



Grundy county, Post Tertiary beds in. . . .191 



Grundy county, Coal Measures in 194 



Grundy county, Cincinnati group in 200 



Grundy county, Trenton limestone in. . . .201 

 Grundy county, St. Peters sandstone in.. .201 

 Grundy county, economical geology of. . .202 

 Grundy county, artesian wells in 205 



Halonia 450 



Halonia tuberculata 451 



Helodus compressus 360 



Helodus rugosus , . 359 



Henderson county, geology of. 276 



Henderson county, Coal Measures in 278 



Henderson county, Keokuk group in 279 



Henderson county, Burlington limestone in281 

 Henderson county, Kinderhook group in. .285 

 Henderson county, economical geology of 286 



Hydraulic limestone 40, 205 



Hymenophyllites 410 



Hymenophyllites alatus 41 1 



Hymenophyllites adnascens .... 414 



Hymenophyllites arborescens 415 



Hymenophyllites Clarkii 416 



Hymenophyllites delicatulus 412 



Hymenophyllites furcatus 470 



Hymenophyllites Gutbierianus 416 



Hymenophyllites inflatus 414 



Hymenophyllites lactuca 415 



Hymenophyllites mollis 418 



Hymenophyllites myriophyllum 412 



Hymenophyllites Schlotheimii 412 



Hymenophyllites splendens 413 



Hymenophyllites Strongii 417 



Hymenophyllites tenuifolius 413 



Hymenophyllites thallyformis 417 



Hymenophyllites trichomanoides 411 



Hymenophyllites tridactylites 411 



Iron ore 21, 87, 106, 174, 223, 285, 262 



Iron ore, analyses of 87 



Kankakee and Iroquois counties,geology of. 226 

 Kankakee and Iroquois counties, Drift in . . 229 



