IV 
INDEX. 
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Pecopteris choerophylloides..404 
'Pecopteris dentata.404 
Pecopteris elegans.40S 
Pecopteris flavicans.404 
Pecopteris hemiteloides.401 
'Pecopteris villosa.402 
Peltodus.362 
Peltodus unguiformis.368 
Petalodus curtus.366 
Petrodus pustulosus.869 
Physonemus gigas.373 
Pike county, geology of. 24 
Pike county, Niagara limestone in..26 
Pike county, Kinderhook group in. 27 
Pike county, Burlington limestone in.... 29 
Pike county, Keokuk group in. 31 
Pike county, St. Louis group in. 32 
Pike county, Coal Measures in. 82 
Pike county, Quaternary system in. 36 
Pike county, economical geology of. 37 
Platysomus circularis.347 
Poeeilodus convolutus.866 
Polyrliizodus Littoni..357 
Polyrhizodus truncatus.357 
Potters’ clay... .60, 71, 86, 162, 204, 221, 262 
- 
Rhabdocarpus..461 
Rhabdocarpus clavatus.461 
Rhabdocarpus mammillatus.461 
Rizodus reticulatus.849 
Rinodus.374 
Sandalodus crassus.369 
Schizopteris ..411, 418 
Scliutzia. .427 
Schutzia braeteata.427 
Schuyler county, geology of. 75 
Schuyler county, Quaternary system in.., 76 
Schuyler county, Coal Measures in. 77 
Schuyler count}', St. Louis group in. 84 
Schuyler county, Keokuk group in. 84 
Schuyler county, economical geology of... 85 
Sigillarise semina.....463 
Sigillaria alternans.447 
Sigillaria Cistii.447 
Sigillaria corrugata. 445 
Sigillaria Massiliensis .446 
Sigillaria spihulosa.....447 
Sigillarioides.449 
Sigillarioides radicans.449 
Sigillarioides stellaris.450 | 
PAGE. 
Sphenopteris elegans.410 
Sphenopteris gracilis.408 
Sphenopteris mixta.409 
Sphenopteris scaberrima.408 
Sphenopteris trifoliata.410 
Sphenophyllum cornutum.421 
Sphenophyl lum filiculmis.422 
Springs, mineral.22, 89, 148, 189 
Springs, Perry.40 
Springs, Versailles. 73 
Staphylopteris.405 
Staphylopteris asteroides.406 
Staphylopteris sagittatus.407 
Staphylopteris Wortheni.405 
Stark county, geology of.325 
Stark county, Quaternary^deposits in..... 325 
Stark county, Coal Measures in.326 
Stark county, economical geology of. .. .330 
Stark county, soil and agriculture of... .333 jfvonl 
Stigmaria elliptica.461 
Stigmaria umbonata.452 
Stigmarioides.452 
Stigmarioides affinis.455 
Stigmarioides linearis.455 
Stigmarioides selago.458 
Stigmarioides truncatus.453 
Stigmarioides villosus.454 
Stigmarioides? rugosus.470 
Syringodendron cyclostigma .449 
Syringodendron pes-capreoli. 448 
Syringodendron Porteri...448 
Tazewell, McLean, Logan and Mason coun¬ 
ties, geology of. 176 
Tazewell, McLean, Logan and Mason coun- * 
ties, boundaries of..176 
Tazewell, McLean, Logan and Mason coun¬ 
ties, geological formations in.177 
Tazewell, McLean, Logan and Mason coun¬ 
ties, Drift section of.178 
Tazewell, McLean, Logan and Mason coun¬ 
ties, Coal Measures In...179 
Tazewell, McLean, Logan and Mason coun¬ 
ties, economical geology of..18^ 
Trigonoearpum noeggerathii.460 
Trigonocarpum olivaeformis.460 
Ulodendron.434 
Ulodendron elongatum.437 
Ulodendron ellipticum.436 
Ulodendron majus.435 
”3 
