160  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   L906,   PART    I. 
from  the  Warrior  coal  field  or  from'points  in  Tennessee.  These  dis- 
advantages are  partly  offset,  however,  by  the  fact  that  the  district  is 
closer  to  the  Mississippi  Valley  markets  than  are  Birmingham  and 
Chattanooga,  and  also  because  there  is  a  market  for  a  portion  of  the 
pig  iron  among  local  manufacturers.  One  important  enterprise  thas 
might  be  cited  in  this  connection  is  the  Sheffield  rolling  mill,  which 
consists  of  12  double  puddling  furnaces,  6  heating  furnaces,  and  4 
trains  of  rolls,  and  has  an  annual  capacity  of  30,000  tons,  including 
such  products  as  bars,  rods,  and  cotton  ties. 
