GENERAL INDEX. 49 



Jackson Co., Lower Helderberg group 111,62 



Economical Geology, (coal, building stone, iron ores, lead ore, 

 saltpetre, brine, sand and clays, agriculture) 111,76 



Jasper Co.. (A. H. WOBTHES) VI, 31-36 



Physical features VI,31 



Sections of strata YI.33-35 



Quarternary deposits VI, 31 



Coal measures VI.31 



Economical Geology, (coal, building stone, lime, sand and clay, soil 

 and timber) YI.35 



Jefferson Co., (H. EXGELMAITN) m,219-238 



Physical features 111,219 



Coal measures m.220; Vm.56 



. " Economical Geology, (coal, mineral springs, building material, agri- 

 culture) 111,235 



Jersey Co., (A. H. WOBTHEN) IH,104-121 



Physical features 111,104 



Four steel engravings of landscapes in the county, showing outcrops 

 of Subcarboniferous and Niagara rocks Opp. 111,59,61; IV.front- 

 ispiece; V, frontispiece. 



Sections of strata m,105-109 



' ' Quarternary deposits HI, 105 



Coal measures HI, 107; VII, 12 



St . Louis group HI, 11 1 



Keokuk group HI, 112 



" Burlington group m,113 



Kinderhook group HI, 115 



Black slate group HI, 115 



Hamilton group HI, 116 



Niagara group HI, 116 



Cincinnati group Ht.117 



Trenton group HI, 118 



Economical Geology, (coal, clays, hydraulic limestone, lime, building 

 stone, soil, timber, etc.) HI.118 



JoDaviess Co., (JAMES SHAW) , V.25-56 



Physical features V. 25 



Map of the Galena Lead Region opp. 1,154 



Diagram of lead bearing crevices near Galena opp. 1,182 



View of lead bearing rocks and furnace near Galena I, frontispiece 



Sections of strata 1,141,16-2,174; V.38 



Quaternary deposits V, 28 



Niagara limestone V, 33 



Cincinnati group V.35 



Galena limestone V.36 



Trenton limestone V.38 



Economical Geology, (building stone, lime, clays and sand, min- 

 erals,) V.39 



Lead mining 1,153-207; V.40-56 



JOHNSON Co,, (H. EKGET.MAXX) 1,376-409 



Physical features 1,376 



Sections of strata 1,380-397: Vm,54 



Tertiary ? sand 1, 409 



Coal measures (Conglomerate beds) 1,397-404 



Chester group 00 distinct divisions) 1,381-397 



7 



