368  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.  [bull.  2t>0„ 
separated  the  coal  seams  of  the  Warrior  Basin  into  six  groups,  which, 
from  above  downward,  are  as  follows:  The  Brookwood,  Gwin,  Cobb, 
Pratt,  Mary  Lee,  and  Black  Creek.  The  seams  discussed  in  the 
following  pages  are  included  in  the  above  groups,  as  follows:  In 
the  Brookwood  group,  the  Brookwood,  Milldale,  Carter,  and  Clem- 
ents seams;  in  the  Gwin  group,  the  Gwin  and  Thompson  Mill 
seams;  in  the  Cobb  group,  the  Cobb  seams:  in  the  Pratt  group,  the 
Pratt,  Nickel  Plate,  and  American  seams;  in  the  Mary  Lee  group, 
the  Mary  Lee,  Blue  Creek,  Jagger,  and  Ream  seams;  in  the  Black 
Creek  group,  the  Jefferson  and  Black  Creek  seams. 
BROOKWOOD    GROUP. 
The  Brookwood  is  the  uppermost  seam  of  any  importance  in  the 
quadrangle.  It  is  well  known  and  developed  only  at  Brookwood, 
Searles,  and  Central.  At  the  last  two  places  it  is  about  7  feet  thick, 
with  several  partings  of  clay  and  bone.  This  coal  was  formerly 
mined  near  Cedarcove,  about  2  miles  north  of  Clements,  and  the 
old  mine  is  being  reopened.  At  this  point  the  coal  is  about  30  inches 
thick. 
The  following  sections  exhibit  the  character  of  the  seam  in  these 
localities : 
Section  of  Brook  (rood  scan)  at  Cent  rat  mine,  Kellcrman. 
Shale  roof :  Inches. 
Coal 24 
Bone 3 
Coal 8 
Bone 1 
Coal 8 
Bone 1£ 
Coal Hi 
Slate \ 
Coal G 
Slate 9 
Coal 14 
Total 86J 
Section  of  Brookwood  scam  at  mine  No.  12  of  Alabama  Consolidated  Coal  and 
Iron  Company,  Brookwood. 
Inches. 
Coal_ 2 
Clay  ___,_ 41 
Coal 20 
Shale 1 
Coal 1\ 
Slate 2 
Coal " 11 
Total 48 
