RICHARDSON.]    NATURAL    GAS    NEAR   SALT    LAKE    CITY,    UTAH.  483 
gas  in  quantity  is  dependent  not  only  on  a  sufficient  supply  of  organic 
matter,  but  also  on  the  presence  of  porous  reservoirs  effectively 
capped  by  impervious  material  to  collect  and  retain  the  hydro- 
carbons. Unfortunately,  in  the  Bonneville  area  the  presence  of 
such  conditions  can  not  be  predicted.  It  may  be  stated,  though,  that 
prospecting  for  gas  should  not  be  undertaken  in  the  vicinity  of  the 
base  of  the  mountains  where  recent  faulting  has  taken  place.  Actual 
occurrences  of  gas  in  this  region  can  be  discovered  only  by  the  drill. 
