butts.]  WARRIOR   COAL   BASIN,   ALABAMA.  371 
Creek  and  Shoal  Creek,  and  what  is  probably  the  same  seam  was  seen 
in  the  midst  of  sandstone  near  the  road  midway  between  Cohort  and 
Patton  Ferry,  where  it  is  1  foot  thick.  The  sandstone  is  that  con- 
nected with  the  Brookwood  coals,  and  the  position  of  the  coal  in  the 
sandstone  would  indicate  that  it  is  the  Carter  seam. 
The  Clements  coal  is  a  seam  of  some  importance  at  Clements,  in 
the  region  east  of  Razburg,  and  especially  on  the  ridge  to  the  west  of 
Mud  Creek  northwest  of  Adger.  Mr.  McCalley  states  that  it  is  from 
2  to  4  feet  thick  in  this  region. 
GWIN  AND  COBB  GROUPS. 
The  Gwin  coal  has  a  wide  distribution  in  the  northeastern  part  of 
the  quadrangle,  where  it  is  from  2  to  4  feet  thick,  with  2^  feet 
probably  a  fair  average.  It  also  appears  to  be  of  good  thickness 
along  the  southeast  margin  of  the  field.  The  coal  makes  a  good 
showing  on  Indian  Creek  and  is  reported  to  be  2  to  2-J  feet  thick  in  one 
locality  near  the  head  of  Blue  Creek  west  of  Black  Warrior  River. 
So  far  as  observed,  however,  the  seam  is  thin  and  worthless  over 
most  of  the  territory  west  of  Black  Warrior  River  and  throughout 
most  of  a  strip  several  miles  in  width  east  of  that  stream.  The  Cobb 
coals  are  best  known  along  the  streams  in  the  northeastern  part  of 
the  quadrangle.  They  are  generally  less  than  2  feet  thick,  but  may 
be  thicker  along  the  southeastern  inargintof  the  Big  basin.  Neither 
the  Gwin  nor  Cobb  coals  are  at  present  commercially  important  in 
this  quadrangle. 
PRATT  GROUP. 
The  Pratt  coal  is  known  only  along  the  southeastern  margin  of  the 
Big  basin  and  on  Valley  Creek  in  the  vicinity  of  Toadvine.  Else- 
where the  seam  is  several  hundred  feet  below  the  surface.  Along 
Valley  Creek  the  coal  is  not  over  2  feet  thick,  so  far  as  learned.  The 
seam  is  not  very  well  known  along  the  southeastern  margin  of  the 
field.  As  identified  it  is  from  3|  to  G  feet  in  thickness,  with  thick 
clay  partings  where  thickest. 
Below  are  a  few  sections  representative  of  the  character  of  the 
seam. 
Section  of  Pratt  scam  on  Valley  Creek,  2  miles  west  of  Toadvine. 
Shale :  Inches. 
Coal 12 
Bone 2i 
Coal—  — • 7 
Bone  1 
Coal 1 
Total 23$ 
