CLAYS    AND    SHALES    IN    CLARION    COUNTY,  PA.  343 
Coal  and  natural  gas  are  available  in  nearly  all  parts  of  the  region, 
affording  efficient  and  cheap  fuel.  Prices  of  natural  gas  for  com- 
mercial use,  quoted  to  the  writer,  range  from  8  to  22  cents  per 
thousand  feet.  An  idea  of  freight  rates  may  be  obtained  from  the 
following  quotations  from  Sligo: 
Sligo  to  Pittsburg,  $1.40  per  ton  for  clay  and  $1.60  for  brick. 
Sligo  to  Buffalo,  $1.60  per  ton  for  both  brick  and  clay. 
