USEFUL MET \ 



FIG. 107. -View i>l liinonite pit near Irontoii, Pennsylvania. (B\ 

 mission of the Macmillan Company, from Ries' Economic Geology.) 



FIG. 108. Pit of residual limonite, Shelby, Alabama. (By permission 

 of the Macmillan Company, from Ries' Economic Geology.) 



