INDEX. 391 



PAGE. 



Taylor County 344 



Thielsen, H., quoted '. 331 



Topography, general, of the State. , 29 



Trenton limestone 174 



Unconformability of Coal-measure Strata ... 225 



St. Louis Limestone Strata 225 



Union County 330 



Upper Coal-measures 241 



concerning relative position of 241 



fossils of 247 



Upper Silurian System , 182 



Wachsmuth, Charles, collection of Burlington Crinoids 209 



Walled Lakes 74 



Whitney, Prof. J. D., on Dubuque Lead-mines 177 



Wilson's, section of strata at, in Fremont County 358 



Winterset section of Upper Coal-measure strata 246, 308 



Worthen, Prof. A. H., on St. Louis Limestone at Warsaw, Ills 217 



EREATi. 



Page 93, 16th line from top, for "glacial-scored," read " glacier-scored." 

 Page 122, 6th line from the bottom, for " analysis," read " analyses." 

 Page 195, 13th line from the top, add "in Washington" before •'county." 

 Page 201, 10th line from the top, for "Brachiopa," read " Brachiopoda." 

 Page 201, 18th line from the top, for " Tayosites," read " Favosites." 

 Page 201, 4th line from the bottom, for " Encrimtal," read " Encrinital." 

 Page 220, 3d line from the bottom, for " Holoptychins," read ■' Holoptychius." 

 Page 221, 2d line from the bottom, for " canadeuse," read " Canadense." 

 Page 241, 9th line from the top, for "canda-galli," read " cauda-galli." 

 Page 262, 8th line from the top, erase the word " there." 

 Page 271, 4th line from the bottom, for " species," read " spines." 

 Page 301, 9th line from the top, for " None." read " Some." 



