252 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   1903. 
[BULL.  225. 
On  the  south  side  of  the  basin,  about  1  mile  west  of  Manning's 
ranch,  a  shaft,  which  shows  three  coal  beds,  has  been  sunk  well  up  on 
the  mountain  side.  This  is  known  as  Crowe's  shaft,  and  has  the  fol- 
lowing general  section: 
Section  of  Crowe  shaft. 
Ft. 
50 
30      0 
1     11 
15 
0 
2 
0 
3 
0 
2 
OJ 
0 
0 
Shale  and  sandstone ■ 
1.  Coaly  shale 2  inches 
2.  Sandy  parting 2  inches 
Coal  3.  Coaly  shale 4  inches 
4.  Sandy  parting 3  inches 
5.  Coal,  very  hard 8  inches 
Sandstone  and  shale 
il .  Carbonaceous  shale 6  inches] 
2.  Sandstone 3  inchest 
3.  Coaly  shale 14  inches] 
Shale 
Sandstone 
Shale 
Jl.  Carbonaceous  shale 6    inchesl 
Coa{2.  Coal 18*  inches} 
Carbonaceous  shale 
Total 105      6* 
The  highest  coal  bed  in  this  section  is  badly  crushed  and  faulted  at 
the  point  where  it  is  cut  by  the  shaft,  and  it  is  doubtful  whether  the 
section  given  above  represents  its  true  thickness  and  structure.  The 
lowest  bed  shows  considerable  crushing,  but  the  section  given  above 
is  about  normal. 
The  correlation  of  the  coal  beds  found  in  the  Crowe  shaft  and  the 
coal  of  the  Reed  mine  is  somewhat  difficult.  This  shaft  was  not  sunk 
through  the  Cretaceous  rocks,  but  it  seems  probable  that  the  lowest 
bed  of  coal  occurs  within  10  feet  of  the  top  of  the  limestone,  which  is 
well  exposed  in  a  near-by  ravine.  If  that  be  true,  the  uppermost  bed 
of  coal  occurs  about  60  feet  above  the  limestone.  This  is  nearly  the 
position  in  which  the  coal  is  found  in  the  Reed  shaft.  It  is  at  least 
30  feet  above  the  limestone,  and  may  be  as  much  as  40  or  50  feet. 
The  exposures  in  the  vicinity  of  the  Reed  slope  are  not  very  satisfac- 
tory, but  some  indications  of  coal  smut  were  seen  near  the  top  of  the 
limestone  in  the  ravine  west  of  the  slope,  which  seems  as  though  it 
might  correspond  with  the  bottom  bed  in  the  Crowe  shaft.  Since  the 
writer  visited  the  field,  according  to  Mr.  Mellor,  prospecting  has  been 
done,  for  the  purpose  of  determining  whether  a  lower  bed  is  present 
near  the  Reed  slope,  but  nothing  was  found.  It  seems  probable,  how- 
ever, that  the  coal  of  the  Reed  shaft  and  slope  is  about  equivalent  to 
the  highest  bed  in  the  Crowe  shaft,  and  that  the  smut  seen  near  the 
limestone  at  the  Reed  mine  is  at  about  the  same  horizon  as  the  lowest 
bed  in  the  Crowe  shaft. 
Mr.  Mellor  recently  has  discovered  traces  of  a  coal  bed  near  the 
