butts.]  WARRIOR    COAL    BASIN,    ALABAMA.  367 
Hurricane  Creek  about  one-half  mile  above  the  covered  bridge  on  the 
Clements  road,  and  another  about  1|  miles  above  the  same  point.  On 
Daniel  Creek,  about  one-eighth  mile  above  the  bridge  on  the  Tusca- 
loosa road,  is  a  conspicuous  fault,  and  on  Black  Warrior  River,  in  a 
cut  of  the  Mobile  and  Ohio  Railroad  about  1  mile  below  the  mouth 
of  Daniel  Creek,  is  another  point  where  faulting  was  observed.  Cer- 
tain irregularities  in  the  rocks  on  the  west  side  of  the  river,  near  the 
mouth  of  Laurel  Branch  and  also  about  2^  miles  higher  up  the  river, 
indicate  faulting.  The  strike  of  these  faults  is  uniformly  N.  45°  to 
50°  W.  It  is  assumed  that  there  are  two  parallel  faults  crossing  the 
region  about  1^  miles  apart.  The  first  crosses  North  Fork  of  Hurri- 
cane Creek  at  the  upper  point  described,  passes  near  the  bridge  across 
Daniel  Creek,  and  crosses  Black  Warrior  River  about  2h  miles  above 
the  mouth  of  Laurel  Branch.  The  second  fault  is  1^  miles  to  the 
southeast  of  the  first  and  passes  through  the  points  already  mentioned. 
The  strata  between  these  faults,  or  the  fault  block,  are  downthroAvn 
on  Hurricane  Creek,  so  that  the  thick-bedded  sandstone  associated 
with  the  Brookwood  group  of  coals  abuts  against  the  shale  that 
normally  underlies  it.  The  total  downthrow  may  equal  but  prob- 
ably does  not  exceed  160  feet.  On  Black  Warrior  River  the  rocks 
between  the  faults  are  downthrown  along  the  northeastern  fault,  but 
upthrown  along  the  southwestern  fault.  These  facts  indicate  a 
torsion  of  the  fault  block  between  the  river  and  Hurricane  Creek. 
In  the  bluff  of  Yellow  Creek,  one-half  mile  above  its  mouth,  is  a  con- 
spicuous fault,  and  what  is  apparently  the  same  fault  was  traced 
southeastward  to  the  point  where  the  Keens  Mill  road  crosses  the  little 
stream  If  miles  northwest  of  Olmstead.  At  the  last  point  there  is 
either  a  fault  or  a  sharp  iiexure.  The  rocks  along  this  fault  are 
apparently  upthrown  on  the  northeast  side,  the  amount  of  upthrow 
on  Yellow  Creek  appearing  to  be  about  80  feet.  In  addition  to  these 
faults  observed  on  the  surface,  faults  have  been  encountered  in  mining 
operations  at  Brookwood,  Milldale,  and  Johns.  West  of  the  Louis- 
ville and  Nashville  Railroad,  between  Adger  and  McAdory,  the 
Little  basin  is  reported  to  be  crossed  by  a  fault,  which  brings  up  the 
Black  Creek  coal  to  the  level  of  the  Blue  Creek,  indicating  a  throw 
of  from  250  to  350  feet.  It  seems  not  unlikely  that  there  is  much 
more  faulting  of  a  similar  nature  in  the  field. 
THE  COALS. 
The  coals  of  the  Warrior  basin,  including  those  in  the  Brookwood 
quadrangle,  were  very  fully  investigated  by  Mr.  Henry  McCalley, 
and  his  results  were  published  in  the  Report  on  the  Warrior  Coal 
Basin.  The  present  survey  has  added  but  little  to  the  detailed  knowl- 
edge of  the  various  seams  published  in  that  report.     Mr.  McCalley 
