V 
II INDEX. 
Cy ch Cfrl/UAJ . Jo 
PAGE. 
Coal shaft, Braidwood.213 
Coal shaft, Martin’s, Mercer county.303 
Coal shaft, Bradford, Stark county.327 
Coal shaft, S. C. Francis’, Stark county. .326 
Coal shaft, Metamora...337 
Coal shaft, Minonk.338 
Cladodus deflexus.356 
Cladodus elegans.354 
Cladodus iscliypus.354 
Cochliodus costatus.364 
2»4(' Cordaites angustifolia.420 
Ctenacanthus Mayi.372 
Cymatodus.363 
Cymatodus oblongus.364 
PAGE. 
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 
^run^TOurfty/geology of..' 
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 
Hy menopliyll ites.410 
Hymenophyllites alatus.411 
Ilymenophyllites adnascens.414 
Hymenophyllites arborescens.415 
Hymenophyllites Clarkii.416 
Hy men ophy 11 ites de 1 i catulus.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, 235, 262 
Iron ore, analyses of. 87 
Kankakee and Iroquois counties,geology of.226 
Kankakee and Iroquois counties, Drift in.. 229 
DeKalb, Kane and Dupage counties, geolo¬ 
gy of . 111 
DeKalb, Kane and DuPagc 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.350 
Edestus vorax..350 
Edgar county, geology of. 266 
Edgar county, section of rocks in.267 
Equisetites.425 
Equisetites occidentalis .425 
i //cx/u 
Fossil Ashes, remarks on.345 
Fossil plants. .377 
Fossil plants, distribution of..500 
Fossil plants, list of.....471 
Fossil plants, preserved in coal ..... _478 
Fossil plants, preserved in shale.479 
Fossil plants, preserved in concretions.. .481 
Fossil plants, preserved by mineralization.488 
Fossil plants, affinities of...489 
