itiCHAEDSON.]    NATURAL    GAS    NEAR    SALT    LAKE    CITY,    UTAH.  481 
relations  of  evaporation,  precipitation,  and  inflow.  The  border  of 
the  lake,  therefore,  is  marshy  and  is  covered  more  or  less  with 
evaporated  salts.  The  underlying  deposits  are  chiefly  sand  and  clay 
derived  from  the  disintegration  of  the  adjacent  mountains  and  de- 
posited in  Lake  Bonneville. 
Though  gas  has  been  found  in  numerous  wells  within  the  area  out- 
lined above,  the  greatest  development  has  occurred  about  1*2  miles 
north  of  Salt  Lake  City,  in  the  marshy  tract  near  the  shore  of  Great 
Salt  Lake.  (bis  is  reported  to  have  been  discovered  in  this  region  in 
1892,  and  in  the  winter  of  1894-95  a  6-inch  pipe  line  was  laid  to 
Salt  Lake  City.  The  producing  field  was  confined  to  an  area  of  only 
about  1  square  mile  in  sec.  36,  T.  3  N.,  R.  1  W.  Here  about  20 
wells,  ranging  from  2  to  4  inches  in  diameter  and  averaging  about 
500  feet  deep,  were  sunk.  Two  wells  were  also  driven  in  the  lake 
deposits  to  depths  of  1,200  and  1,400  feet.  Records  were  not 
kept  of  these  wells,  but  the  drillers  state  that  in  general  a  variable 
succession  of  fine-textured,  unconsolidated  sand  and  clay  was  encoun- 
tered, and  that  bed  rock  was  not  reached.  Detailed  conditions  vary 
in  adjacent  wells,  indicating  lenticular  arrangement  of  the  deposits. 
(bis  occurs  at  different  depths  in  the  area  developed,  but  mostly 
between  400  and  700  feet.  In  one  well  three  gas  horizons  were 
struck  at  502,  542,  and  602  feet.  In  another  well,  800  feet  deep,  nine 
good  strong  flows  "  of  gas  are  reported.  The  gas  is  said  to  occur 
in  sand  which  is  underlain  and  overlain  by  clay,  the  beds  ranging 
from  3  to  20  feet  in  thickness.  The  productive  sands  are  reported 
generally  free  from  water,  though  small  artesian  flows  were  found  in 
overlying  beds. 
The  pressure  of  the  gas  in  the  wells  is  said  to  have  averaged  about 
200  pounds,  and  a  maximum  pressure  of  250  pounds  has  been  recorded. 
Prof.  J.  T.  Kingsbury,  assisted  by  students  of  the  University  of 
Utah,  in  the  fall  of  1804  made  the  following  analysis  of  gas  col- 
lected at  the  wrells : 
Analysis  of  Salt   Lake  fins. 
[Per  cent,  by  volume.  I 
ch4 : 22.  :\ 
C2Hfi :5T.  s 
C2H4 .7 
CO ___        1.2 
CO, .  8 
H 16.6 
N U».  7 
O .9 
Total 100.0 
Bull.  260—05  m 31 
